feeling stupid

I feel so stupid/slow in my life. I'm so unhappy. I'm 19 and still living under my parents roof. Im having trouble learning how to drive a car (precisely parking) and I'm being pressure to learn for I can have a reliable transportation to school since my mom is tired of taking to school. She always calls me stupid and how she learned how to drive in a day. it been over a month to learn how to park and I still don't get it and im trying. I don't have job due to special circumstances. I compare my life to anothers around my age and they all doing better. Sometimes I just don't feel ready for life in general and been having a couple of negative thoughts.