I'm really embarrassed about this, but I have a super bad habit; I bite my nails. It makes it really hard to paint my nails, because they are so small. Any ideas on how to stop biting my nails?

I used to bite my nails...Until I took an ARROW/アロー in the knee.

Jk.

They sell this nail polish (which is clear によって the way) and it has a 苦い taste. I tried it and I stopped biting my nails, 'cause it tasted like shit. I don't know if they have it where あなた live (I live in Chile)

Answer your question?

My Aunt did that then she just acted as if she didn't have nails to stop but あなた could try what she did idk :/

Put tape om your nails

Put something like polish remover または soap on them so you'll avoid biting them to avoid the bad taste. Eventually you'll get used to avoiding biting your nails you'll just stop. That's what my mom did.

i bite mine, but i bought this like clear under コート for bails, like nail polish, that あなた put on, it tastes nasty when あなた taste it, so... i dont bite mine much any more, its like antinail bite stuff

hmmm... That's a common and hard to break habit.
What I suggest is that あなた tell someone あなた always stay with (for example, if you're always with your brother/sister) to nudge あなた または something everytime they catch あなた biting your nails. または あなた could try something outrageously ridiculous and do something to make your nails smell funny. :P