Anxiety and depression. I need guidanc!

I was suffering from depression i don't know since when because i was sure about it in the month of december and then the whole dec and jan i was ailing from this problem. I didn't want to meet anybody i was in my room the whole time i didn't talk to anyone i used to cry every night and even thought about ending my life because i just could not bear anything further then i just got to know in the mid of jan that i was about to go to london for a summer school and i don't know hopes revived and i was better then in may 2017 only i have again started to feel exactly what i felt few months ago. And i know why i am feeling all this it's because i was forced to take up a career choice i didn't wanna do at all. I am doing eco hons but i always hated it i never wanted to do it. My parents are just not understanding. They don't support me enough. I always have to beg to ask for permissions. I don't have a very good friendly kind of a relationship with my dad it's way too formal. i need guidanc