Why am i so pissed at the world all the time?

I've been sheltered my childhood to where I've had to learn a lot of things i could have learned when i was 15-16 years old, just on my own without any help, and so because I felt like i was "shut up" by my parents words or by meds when i would try to speak my mind and tell them how i really felt I have a huge problem with being really mad at the world, as in deeply angry to where at the most random moment i feel like releasing all my anger on something or someone. I need help. Sometimes its gone so far that I've been pionately interested in very morbid subjects, looked up morbid information or had morbid thoughts. I know this is not how i'm meant to be. I love people. but its like im just pissed. and at the same time i feel like no one will be able to understand. and please dont tell me im some crazy b**tch or emo kid or whatever, i'm a really nice person who's not meant to be like this, and i'm asking honestly for help , because i'm on my own now and i want to live the life i was meant to, but i feel like i'm just too pissed off and burnt out on the world. An honest answer would be nice.