Are you always so rude to people like this? You're 18 years old for goodness' sake! How could you possibly believe you have more knowledge or experience than anyone here? A better question is not why JGirl is on here, but why you are on here. We're all members here for a variety of reasons. I don't think it's wise for you, a brand new member, to question why someone who has been here far longer why they are here.
And setting aside all else, your final statement in your OP would put me off everything about you.