I really want a pet in the family, mom says no. Any tips?

I have wanted a pet for…I dont even know. Forever. I’ve had 4 fish, and two of them died within two days. I had another fish who lived five yaers. He died I think last year. But, I always tell my mom I know how to take care of a dog or a cat and I really do. We tried to have a dog once, but mom travels too much due to her job. I would much rather have a cat than anything.

I have tried absouletly everthing to try to get a pet, and no use. My mom wont even let me get a job as a dog walker. I have no siblings (except a 6 year old brother who lives with my father, but thats another story.) and nothing left to do or tend to but school and sports. I really want your guys’ help. Please! I feel so alone.