I've lived a hard life. I don't smile as much as other Christians. I don't feel the need to fake it either. There was a point in my life when I was radiant of God's love, now I'm just hardened with life's torment. My dad committed suicide 4 years ago and it's been very hard on me. My sister has attempted suicide 4 times, and now I'm just sick of her trying to get attention. My mom and stepdad are awesome Christians. I haven't had a girlfriend since I've become Christian, what's up with that? My road to sexual purity has been bumpy. It seems like happiness comes naturally to everyone else, but I've been through some crap and see things as they are. I was saved by God in jail. Maybe God sees me as a lesser Christian and so he tests my faith more than other Christians to see if I bail out. I'm never going to, more like endure this life. That's all that life feels like, is endurance. Why am I constantly tested and tormented? Why won't Satan ever, ever leave me alone? Why doesn't God comfort me? Why do I question if I'm worthy of heaven if I've already given my life to Christ? Why do other Christians instantly think they're better than me, gain from my misfortune, and seek their own glory?
I'm sorry to read of your tragedy, bear with me I'd like to address it all:
"I've lived a hard life. I don't smile as much as other Christians. I don't feel the need to fake it either. There was a point in my life when I was radiant of God's love, now I'm just hardened with life's torment."
Have you ever heard the expression: sadness and happiness come and go, but the Joy of the Lord always remains. Joy is not so much an expression done through smiling, but more of an understanding of the heart. You can have the Joy of the Lord while being down-trodden. David sure did.
You said: "I haven't had a girlfriend since I've become Christian, what's up with that?"
You're in torment, brother. God can only provide you with your future wife once you are complete, healed, and rooted in His foundation. Providing you with a girlfriend now will only add to your problems.
My road to sexual purity has been bumpy.
Forgive and forget. If your "falls" in terms of sexual purity are enough for you to feel guilt and remorse, then your heart gives witness to a repented state of being. Once you can sin without feeling guilt, you have a serious red flag.
It seems like happiness comes naturally to everyone else, but I've been through some crap and see things as they are.
You've had it rough, and I'm sorry that you're hurting so bad, but it's not good to compare ourselves to others. It's all a matter of perspective but I know if you sat and thought about you'd realize not everything is as it appears. I had a best friend in HS who was worthy of being envied. She had such an awesome relationship with her mom and free life. After, she graduated I found out that she was bulimic and had to have surgery to repair the damage to the esophagus and had been kicked out of her home for a year. Our entire year of HS no one could have ever guessed the misery she was going through, she gave the appearance that she was perfectly happy.
Maybe God sees me as a lesser Christian and so he tests my faith more than other Christians to see if I bail out.
No, this is a lie that Satan is trying to get you to believe. In the eyes of God we are all equal. And I would say that you are in an advantage over Christians who grow up in Christian homes. The Bible says "He who is forgiven much, loveth much" (Luke 7:47 paraphrased). It's easier for those who understands the awfulness of their sin to see how awful it is, then it is for one born in a Christian home to recognize their sin (how can they, they have to be good!)
God only tests us for one reasons--to expose to us what is in our hearts. Sometimes we think we are not very strong, so God tests us to expose to us that we are indeed stronger than we think. Sometimes we think we are strong, but God's test proves to us that we are not so strong.
Think about the tests you've been through and determine what God wants to say to you through them. Once you've learned the lesson the testing will stop.
Why am I constantly tested and tormented? Why won't Satan ever, ever leave me alone?
If you're being tormented then there may be an open door the enemy is using to get in. What happens is when we are broken and in pain, we sometimes respond in sinful ways. Like sinful anger or bitterness. Having those things in our hearts allows the enemy a place to torment us. Ask the Lord to close all the doors that you may have unintentionally opened in your pain, and then ask Him to heal you so that the devil can never have access through the pain of the loss of your father through suicide again. God will certainly give you grace through the healing journey.
Why doesn't God comfort me?
This is a lie God does comfort His hurting children. There can be many reasons, perhaps He tries but you won't allow Him. In some areas of my heart, I am inconsolable. It's been a struggle. I would ask the same question "Why won't you comfort me" until He revealed to me that He was trying but I wasn't letting Him. Or it good be that He is comforting you but in your pain and darkness you can't see it. There can be many reasons you know know it, but He certainly wants to comfort you.
Why do I question if I'm worthy of heaven if I've already given my life to Christ?
I am going to reply because you have little to no self-esteem. You don't believe you have any worth so why would you be worthy of Heaven? None of us our worthy of the Lord's heaven. We all get in through the grace and love of God. Heal the way you see yourself and this issue may go away. (If your self worth is the root of the issue that is).
Why do other Christians instantly think they're better than me, gain from my misfortune, and seek their own glory?
Because they are broken, just like you are, and trying to make themselves feel better by hurting you. The abused abuse until someone breaks the cycle. That is why the Lord calls us to forgive and bless, to break the cycle.