I need help, i cant handle the stress anymore and find every day unbearable.?

I don't mean to be dramatic but I feel like i cant handle it anymore. I come from a family which is very accomplished and successful. I unfortunately don't fit in. Im not smart, and not cut out to be in university. My parents are forcing me to do university and they are brown so there are not many choices. I want to be a teacher which I think i would be very good at, however my choices are doctor, lawyer, engineer, and MBA. Aside from that what ever i do would make them unhappy. iv tried for years t pretend to be who they want, however i cant do it anymore. iv tried so hard to be who they want i don't even know anything about myself. Im 18 and thought of running away but i couldn't do that to my family. im out of options and depressed. i cant be this person anymore. my parents expect the world from me but im not good enough to be who and what they want. im tired and i can barley make it out of bed in the morning. the walls of my university are like the walls of a prison and i know that's hard to believe but i actually look at the floor when im there because i cant stand the look of the place. i hate my life. i know people have it much worse then me but i cant explain why i don't fit into this suburban utopia. my parents would never let me do what i want with my life, and because im not allowed to work im financially dependent on them. i cant take this anymore. every day i feel like it should be the last day of my life because i can see my whole life like i have already lived it. ill go to law school maybe work for a year or two before i have to get married, then children. then ill have to quit until there in grade school. then ill have to balance house work and cleaning all whilst starting up my career again, by the way a career ill hate. then my kids will feel the same pressure to be Perfect. never enjoying life but worrying about it. then ill get old and die. it feels like my life is extremely happy at moments but extremely sad at other moments so there is no average. most days are sad. i often cry without a reason, just because i cant take it anymore. i don't see the point in living a life that is empty. iv tried thus far to hide these feelings from everyone. i haven't even told my parents i hate University and would be happy waiting tables the rest of my life. i haven't told them that if i have to go by force if rather do teaching than law. because i know what the would say, they would yell. i just cant do it anymore, maybe i have mental issues.