I've felt guilty about myself throughout my whole life.
What makes you feel guilty?
I don't really know, but it's always there.
If you've done something to feel guilty about, that's one thing, but to just feel guilty all the time is not good. You should go see a counselor to help you feel better about yourself.
Nah, I'm fine. I'm not really sure what to do about it.
Talking to a counselor about how you feel will help you to understand why you feel that way. It will help you to learn what you can do about it and how you can stop feeling guilty.