Why?

Why do guys I'm interested in always end up ignoring me or irritated with me? I pretend it doesn't bother me, but it really hurts. I don't understand what I did wrong. What did I do that warrant such reactions? It has gone to the extent that now I end up tip toeing around them, hoping and hoping that I don't step on their toes. If I agitate them a little bit, I will hold my breath and apologize and pray that they don't stop talking to me. I just want to talk to them, that is all and for them to want to and to enjoy talking to me.

Why? I think I did something wrong, but why can't they just like maybe give me a chance to redeem myself? I don't know what I did wrong. Maybe I always fall for the wrong guys, or maybe I should not fall for anybody at all. I don't want to be on tip toes all the time. I don't know what to do.

Why?