Whenever my mom cries I don't care.
Did she hurt you in the past?
She is never happy with me. Whatever I do it's always somehow not good enough.
Even if you your mom has high expectations of you, you should still try to support her when she cries and is in need of emotional support. Raise your concerns about her expectations and how they make you feel when your mother is in a better emotional state and work to resolve them.
Meh. I only do what I want since I'm going to become a big shot one day.
It's nice to have the confidence to think so highly of yourself, but that should not affect your relationship with your mother. You need to be sympathetic towards her and be there for her. You may never know when you need to rely on her in the future.