Me and my mom

My relationship with my mother is very complicated, it is a selfish person and do not care about me, never talked about sex and boys. She was always very cold with me, never showed affection and love, she fights all the time with me and say that studying is unnecessary. I've tried everything so that our relationship has improved, but it is harsh. Asked her to pay for my studies and she only complains, she is a nervous person and uncontrolled,please help me!