I'm tired of pretending to like my mother.
That sounds difficult. Why don't you like your mother?
I hate her. She's been screwing me over for years now.
I can understand that sentiment. Parents that take advantage of their children are terrible people. You should be upfront and tell your mom how you feel.
Nah, I'm just going to keep pretending to like her. We're family after all.
It's admirable that you want to ease any potential conflict by pretending, but I truly believe honesty is the best policy here. Tell your mother how you feel, but do it in a polite manner.