I'm not thankful to my mom
That feels very ungrateful. What did she do for you to be unthankful?
I'm not thankful to her because she tried to talk me out of my homosexuality.
This can be a hard issue for parents. It is not good for you to fail to be grateful for things your mother has tried to do for you.
It's not just this, my mom has treated me like shit every time I called. She also hates me because I'm gay.
She may need some time to deal with your sexual orientation but let me tell you right now that there's nothing wrong with being one. Some people just need more time to adjust as they are not raised that way. In the meantime, your mother have helped to raise you to become who you are today, and it feels very bad for you to not appreciate that.