should i facebook message this person?

[whatever]

DO IT!!!
Say something like "sorry that i'm adding you like this, it's just that you're a pretty cool person"
Just make sure she doesn't end up thinking you're a weirdo. Make sure she gets to know you and that she'll will wish to know more about you. You can get addicted to a person once you find him/her interesting. So make sure your life's an interesting piece of work to her!

Note: this could make it harder but, stay yourself. Not saying that if you're not a social person that you should stay that way, but just don't go saying you've been in the army and stuff if it's not true lol

And dude, you should really get some friends, it's not that difficult if you're in the right place, join a boxing club or something.