Why can I never be happy for myself?

I think I have a problem with self-undermining or some ****. I can just never feel happy for myself and the things I've accomplished. Sure, I'm happy sometimes, but lately I've been really pushing to do things that are right for me. For example, I used to never take risks or stir the pot and I was always bored and sad. Recently I've started taking risks and going after what I want, and yeah it does make me happy, but I can never seem to maintain that feeling. I always manage to find some way to worry and over yze and gah, it's just so frustrating because I'm trying to hard to just be happy. I dunno if this is really a question but advice would be appreciated.