Why do I do stuff like this?

Ok..so, Saturday night I get what we southerners call a "lie bump" on my tongue. It's irritating to say the least, and I just had to take it off. I tried with my fingers, but my fingers kept slipping. So, then I had this brilliant idea to get the tweezers. In the process of trying to remove the lie bump, I kept plucking my tongue with the tweezers until my mouth was all bloody. It was hard to get the right one, but I kept going until I got it. It hurt like hell, and I kept looking at my eyes in the mirrror, watering up, wondering... why in the world am I doing this to myself? Well, at least noone will know. It won't scar, it won't bruise, so it's ok. Those are the thoughts that were running through my mind. No thought to actually stop what I was doing. Why did I do that? It's just like sores.... when they start healing, it's so tempting to scratch them open. Why do I do stuff like this? And... has anyone else ever plucked their taste buds off their tongue?