Perfectionist!!

I'm always disappointed in myself for not reaching the goal that I wanted to achieve!Some of them say what I want is just too perfect. It's not gonna be materialized. I don't think they are right. I am not a perfectionist. I know very well noone around the world could be perfect. I never expect myself to be the perfect one but why I still fail to achieve my target? Is it that I expect too much of myself? High expectation always comes with high disappoinment, this is what my friend told me. I don't believe it but now...haiz.. I always think that it will never come true if you don't even think of it or give it a try!!! I think I was wrong. Totally wrong! May be it is just not mean to be yours. You will never get it no matter how hard you tried. I always expect myself to achieve this and that. It's sad to know that I can't achieve the result that I wanted. It's even worse than you can't achieve others' expectations.Really feel bad. How am I going to continue to work on it? It seems like I have in no position to have it!! Longing for something always but it never comes true. I doubt it will come true.Have faith in myself? It doesn't work!