I'm 18 years old, and I was born in a Christian family (Evangelical), so I've been going to church and believed in Jesus my whole life. However, I am concerned about salvation. According to what I know, to get saved you have to repent, believe in Jesus, and try to sin as little as possible afterwards. However, I think there are more requirements because I do all of those things but I'm not really sure if I'm saved. Whenever I do sin I repent again (I pray for forgiveness) I know that many people would even consider me unsaved since I asked this question, because supposedly when you are saved you know it for sure and are confident. But the reason that I included my background in the question is because I am already saved, but I just don't see a difference because I don't have the luxury that a non-believer-turned-Christian would have. That is, I can't compare my current situation with my very sinful past and see a distinction, because I've always believed in God. What do you think? I think that even if I am saved, my lack of confidence shows that I am very weak. (By the way please be as direct as you need, and do not worry about offending me at all; this is a very serious topic and I need to know the answer).
P.S. Please include any relevant passages for me if you have any in mind.