I've never had any confidence thanks to my mother
How awful! Does your mother know she's at fault for your lack of confidence?
She has no idea, that's why I'm venting on the computer.
Don't let other people determine how you feel about yourself, you should have confidence in yourself regardless of how others think. Not having confidence can negatively impact your decision making and lifestyle.
Don't I have to have some confidence because of my mother?
Your mother should be a source of confidence building for you yes. If she does the opposite then it might be time to stick up for yourself and confront her. Sometimes children need to take their issues to their parents in order to get things worked out.