To think that being self-deprecating is a self fulfilling prophecy?

[BlackholesAndRevelations]

I just don't think I'm good enough at anything. I let everyone down. And I just feel like it's becoming true (if it wasn't before) and people are thinking it too. Help! I need to stop being so pitiful but I can't. Just feel rubbish and useless Please give me a constructive kick up the bum!!

Ps that sounds pathetic. I don't come across as whiny in real life; try to be smiley and positive (if I can)! I do actually have friends so I must be doing something right!