Grooming seem like a sin, trying to be attractive etc
Does God in His word, the Bible, forbid personal grooming or acting to make oneself attractive to the opposite sex? No. He does condemn self-centered egotism and pride, but one can be well-groomed and attractive to women without being a narcissist. In fact, if you want to be sure not to be of interest to women, go about like an unmade bed all the time, smelly and poorly-dressed.
Wanting to buy stuff that aren't absolutely necessary s food seem like a sin for you are seeking material things, prideful and idolatry like
The apostle Paul wrote that "God has given us richly all things to enjoy" (
1 Timothy 6:17). So, enjoy them! But Paul also wrote that he would not be brought under the power of anything except God (
1 Corinthians 6:12). So, don't overdo it, becoming enslaved to food, or drink, or gaming, or whatever. You can be sure not to become enslaved to such things when you're living in conscious submission to God throughout every day.
Watching horror or action movies, going out even if not doing anything wrong unless it's a trip to the church or a family trip
Well, no lover of Jesus Christ should ever be watching a horror movie, or action movies full of gratuitous violence, demons, and/or sexual stuff. These things are totally opposed to the life, love, peace and holiness of Christ.
Philippians 4:8
8 Finally, brethren, whatever is true, whatever is honorable, whatever is right, whatever is pure, whatever is lovely, whatever is of good repute, if there is any excellence and if anything worthy of praise, dwell on these things.
No one can be a friend of the World and its values, philosophies and common entertainments and be a friend of God, too.
James 4:4
4 ...do you not know that friendship with the world is enmity toward God? Therefore whoever wishes to be a friend of the world makes himself an enemy of God.
1 John 2:15-16
15 Do not love the world nor the things in the world. If anyone loves the world, the love of the Father is not in him.
16 For all that is in the world, the lust of the flesh and the lust of the eyes and the boastful pride of life, is not from the Father, but is from the world.
But the one who has truly found God and is enjoying Him deeply will
want to forsake the evil things of the World, not grieve their loss. God is better, more fulfilling, than anything the World, our flesh, or the devil can offer to us. Do you believe it? If not, you will never discover that He is.
Listening to music that isn't religious
Technology
Even celebrations and some Christian costumes
God doesn't forbid any of these things in His word. But He does tell us never to be under the power of any of these things, addicted to a cell-phone, or porn site, or loving our jazz music or rap more than praises of God, or happier about our beautiful Christmas tree than about Christ's birth.
I'm starting to think I have to build a cabin, grow my own crops and read the Bible 24/7 in order to live my life accordingly
No, you just have to learn how to walk in the Spirit and be filled with him, with his life, and discover, as you are, that walking in him is far, far, far better than enjoying the dark and destructive things the World and the devil tell you that you should have.
Friend, you were made for life with God. It's why He created you. When you forsake God's purpose for your existence, and seek your own purposes, you become like a hammer used to butcher a cow, or a mop used to shingle a roof. You just aren't "fit for purpose" and make an almighty mess of your life.
The problem is, when you start to direct your life the way you want rather than the way God wants, it doesn't seem like doing so is a bad idea. In fact, at the start, it can feel quite wonderful! But God has promised us death - sooner or later, in way or another - when we seek our own way rather than His. Don't destroy yourself! The first sip of a glass of poison may be very tasty, but you'll be dead by the time you finish it.
Galatians 6:7-9
7 Do not be deceived, God is not mocked; for whatever a man sows, this he will also reap.
8 For the one who sows to his own flesh will from the flesh reap corruption, but the one who sows to the Spirit will from the Spirit reap eternal life.
9 Let us not lose heart in doing good, for in due time we will reap if we do not grow weary.