Vows should never be made without preparation- including being sure it is one you can keep (example: don’t make a vow to go to confession every day for the rest of your life- that likely won’t happen- instead, you could make a vow to go to confession every day whenever you could easily go, for a certain time period). I do not know your age, but if you made a vow without understanding clearly what you were doing- especially if you are still under your mom’s authority- I doubt your vow is binding on you. If it would make you feel better, I suggest you discuss this with a priest