Feeling trapped and lost. advice needed.

I(18M) dont feel like I ​love my gf(18F) anymore but cant break up because she is so emotional and lonely.once when i tried to break up with her and ​sh​e said she had suicidal thoughts and she also ​indulged in self harm.i am hurting myself emotionally by not breaking up with her(for past 7 months) .but i still cant bcoz it might hurt her vey badly and that she doesnt have anyone in her life to console her(her parents are strict and she has no frnds).but i dont wanna take this anymore. she wants all my time for herself.she throws tantrums for talking with my frnds.she doesnt let me focus on my exams.for all this time i thought she was doing this out of love and now that i cant take it anymore i feel like its out of dependency and loneliness rather than love.i cant tell this straight to her ​face she will get badly hurt ​and I DONT WANNA HURT HER. but i have to focus on my exams and career. i my passiom v​eryyy muchh but i cant focus on that since i feel ​trapped with her.i just wanna know if i am wrong or she is or should i really breakup with​ her (if yess plss suggest some diff reasons that wouldnt hurt her)and ​how should i handle this?

ps: plss bear my english.i am not a native english speaker.

TL;DR: my gf is emotionally controlling and i cant breakup with her since she is emotinal and lonely but i also feel very much depressed since i cant focus on my passions and talk with my frnds.am i wrong?