I can only speak for myself. Many people claim to be Christian, but are really not."They were not really of us." They were not saved, you say. Now ask yourself if Calvinists are one of us, meaning the majority of people on this forum who are born again Christians. If the answer is no, you are not one of us, then ask yourself what that means for your salvation, and should you come to God in repentance?
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Please explain how you can lose your salvation?
If you fall into sin, do you lose it? If that were the case, anyone saved would lose their salvation.
How many times does the Lord save you?