I have inappropriate thoughts and desires for girls I shouldn't because they are too young.
What are the specific inappropriate thoughts you're having?
I don't just want to make out with them, or have a relationship, or have sex. It's more than that.
We all have inappropriate thoughts sometimes, and they're not that big of a deal as long as they're not overly invasive. If you have invasive, inappropriate thoughts that you can't cope with, then it may be a good idea to seek therapy. If you let the thoughts persist without treatment, then they may hurt your mental health.
WTF, I just want to try some things with them.
It is not okay to have sexual relations with underage girls. Don't you think you should get help to control your thoughts before it is too late?