unknown sources and causes of anger

I've become quite fed up of myself the last couple of weeks, and i'm aware that is a depressing introduction to start with but lets be real when do i begin an entry on a high note. Like every hormonal teenage girl does i struggle with self image but its very diverse because some days i don't care, some days i like how i look and some days i break into tears at the sight of my own reflection. I try not to dwell on it too much but its really hard. Not only that but i've been really angry at everything and everyone for quite a while and sometimes i don't even know why. It's probably since puberty that i've developed these over whelming feelings of anger although i sometimes doubt those feelings are present since they seem to be kept under wrap quite well while i'm with my friends i'm not sure if its because i keep them hidden or maybe its because i'm not so comfortable with them as i think i am deep down, but the most mind boggling possibility could be that they don't give me a reason to lose my shit unlike my family who somehow manage to tick me off every one way while in my presence. i hope someday i find the answer to that but until then i guess it'll be a mystery of unknown feelings and unresolved issues