My mom wont let me shave and im 17?

Maybe you should talk to her and explain to her what kids say and that you are embarrassed and it's uncomfortable to have so much hair under your arms and your legs. If it really doesn't work, then be rebeliois, go to your bff's house (who you can trust) go to CVS buy some products and use them at her house and either throw them out or keep them there. Maybe have a sleepover one night and shave then. Good luck :)