Don't know how to feel better

My friend says I have a low self-esteem and no confidence in myself and I don't think very much of myself. I apologize all the time and he says that my apologies don't mean anything because I say it so much. He says when I apologize I should feel better and not feel bad anymore, but I still feel bad. I really do feel sorry and bad, but I guess he says it's hard to believe me when I say it sooo much. I just want to know how to feel better about myself. My friends also think I could have a.d.d. and axiety. I don't know how to feel better about myself though. I want to. I don't like making my friends frustrated with me. They try to help me, but I'm sure they feel hopeless.

Also, if I am really frustrated or stressed and don't know what to do I think about hurting myself, but then I think about how stupid and pointless that is and I don't. I want to be a better person. I just don't know how or where to begin. I feel bad for my friends for choosing to be my friend. Like I don't deserve t