I always want to have sex. do i just have a high libido or is it a testosterone imbalance? or something else?

High libido: It's been said that (young) men are always thinking about sex. But what's a lot for one may not be much for someone else. Excess testosterone is unlikely unless you're taking some. Inadequate t is not usually associated w/high sex drive but rather decreased/low. More important than sex drive is using protection (condoms) to lower risk for pregnancy & sexually transmitted infections.