Why am i like this?

I have always wondered, why im upset, and stress about everything, i get angry easy, and when i get upset and angry i take it out on myself, i am so cut up,

[Gelise]

Find what makes you stressed, make sure you know your priorities, and becareful who your friends are. The only person that can change you is yourself, and happiness is a choice. :)
I don't really have a clue what I can do to help you. Can you add more details? There is a huge variety of things that can impact how you feel about yourself.