I'm thinking of abandoning my family.
Why do you want to leave your family?
I live with my mom and it hurts when she keeps bumping into me.
You shouldn't abandon people, especially your family, for such a minor reason. Leaving your family would crush them since you are supposed to support those you love. Rather than leaving, just talk to your mom and ask her not to bump into you.
Talking to your mom is too much work. I would rather ignore her.
It is difficult to talk to people about how we feel, but remember, that moving out on your own and starting over is much more work.  Your mom probably doesn't realize that she is causing so much distress, so next time it happens, just let her know that even accidental bumping actually hurts you a lot.