Hi lindsey.
It sounds like maybe your not very happy with your life right now.
Anger is a strong emotion and its hard to know what to do with it.
Unfortunately the past can not be changed but the present can.
It seems that you dont have any one you can talk to that understands or you dont have the words to explain.
Anger is not always a bad thing because now at least you recognise there are things in your life you are not happy with and anger can bring the passion to make changes and do something about it.
I would start by making a list. A list of present things in your life that make you unhappy. Not past events. They cant be changed.
Also think about what you would like in your future. What positive changes could you make to work towards that.
Could you make a list of small realistic goals to set yourself?
Try to surround yourself with positive people that make you feel good.
Do some things for your self just for you weather it be swimming, yoga, or a degree! Anything that will help you find your true self and what you really want or something to help you relax and say "this is me time, just for me and no body else.
I hope this advice is ok and doesnt add to the anger.
I feel that you are very unhappy and i hope things can improve but you need to be the one to make the changes no matter how big or small because we have no control over others actions but we can change how we respond to them.