Sigh.... please don't respond to PM's you get from older men. You are 19 sweetie and I'm going to be upfront there are people here who want nudes from you, who will blackmail you, and who may try to get more than nudes.
You think you can just "protect yourself" but you say that until it is happening. Ignore PM's from older men.
There is no reason for them to PM teenage girls.
Now, just go in a thread and comment your thoughts.... like many said, the speak your mind thread is a great place to hang out