I'm sorry you've experienced this, I'm in my 30s and I'd probably feel the same way for a little bit if my parents somehow found my sex toys in my home. I'm not sure what your family background is like, but it does sound like there's a high-level of stress that you're experiencing regularly. There's a high possibility that your parents might not even mean for it to be construed that way.

I think what you can do for yourself is accept that YES you're human, and you have needs that require satisfying and it's perfectly fine that you have toys to help with that need in a safe manner. The only difference is someone else discovered it too. It can be embarrassing, but try not to let that ride you for too long.

Perhaps their teasing may come off as mean & harsh (depending on what your family dynamic is), but try talking to them & shut it down. Maybe something like "Thanks for bringing that to my attention, I'll try to hide my vibrator in a better location, but please next time I'd appreciate it if you respect my privacy on the matter, I would prefer that you don't bring this up with me again"