I'm single, and tbh I'm really happy about it I'm not sure whether I count in response to that question, being both straight and only 19 years old (like you, actually), but its something that I've pondered a lot lately. The majority of people i went to school with are settling down. They have kids, they are either in a council owned house or renting, in a long term relationship. They are getting engaged and married, if they weren't already.
Throughout all of this, I cant help but feel way too young. I'm already worrying that I will never find someone who's compatible with me, because I'm the first to admit that I have issues and baggage, a lot of which aren't easy things to deal with for both me, and whoever Ive opened up to (and I'm sure anyone close to me would readily confirm that!). That said, in my opinion, to be worried about that at 19 is a little premature My theory at the moment is to be the best person I can be, to focus on my degree and to get my life in order. If that special someone comes along I wouldn't turn away, but it'll happen if its going to happen and I'm not going to try and force it. You have to be happy with yourself before people are happy with you
For the moment, I'm happy to keep living my life on a spontaneous level, doing what I want to do, when I want to do it, and to have as much fun as I can while dealing with any of the crap. Id rather be happily alone with friends who support me, having a good and stable life with a good job (and lots of ponies or cats haha) than be miserable in a relationship just so I could cuddle someone for half an hour a day (and I'm a total cuddler, also a well known GA fact).