I just wanted to chime in. Later on, after you study for a year and get your job, if for some reason that doesn't work out or you want more, you can go back to school. LOTS of people do that. It's not like you have this small window of time to go to school and if you don't, that's it.
You could tell your mom to trust you and let you do things your way first, and if it doesn't work out, you will try things her way.