I feel I don't owe my mom anything
Why don't you feel obligated to your mom?
My mother has not done very much for me, at least as much as other mothers have for their kids. I feel like this $1000 she gave me now after I'm almost grown is mine to keep now.
If you take from someone you should pay it back and be thankful. Most people feel some sort of thankfulness to their parents and like to help them out in the end.
What? I can't do it by myself. Why should I help my mom? I'm in this world to help myself.
Because she is your blood relative, and we have to help these relatives out. If you ever have kids then you'll understand. For now though just trust me on this one. I know you can be a good person.