I'm 19, I'm terrified to be single after 25! ?

Stop worrying about it. Almost all of my friends got MARRIED 18-19 years old. I think they were crazy to do so. Go out with friends, you'll meet people. Do you have a job? You could make friends through work, you never know where that might lead. But if you keep thinking that you will be single when youre 25, then you probably will be. Just have fun being you. Single or not single. :D