What habits or tastes did you keep from your teenage years and that slightly ashame you as an adult?

I won't eat onions of any kind. It's a hard no.

I crave hot pockets. I can eat 4 in one sitting. I just don't buy them anymore because if they're in the house I binge on them. I eat much more healthy now, but if the negative consequences weren't there, I'd eat nothing but hot pockets and fast food.

I'm a nail biter. I've managed to curb the habit enough to have pretty nails most of the time, but every now and then I succumb to the habit and have to regrow them. So annoying.