No, you won't be 19 and alone for the rest of your life. It really does get better but you have to take your time. Don't fret about it too much but be pro-active.
You know, the internet hasn't always existed. How did gay men find one another before?
When I was growing up there used to be books on local cruising places. There may still be for all I know. You can probably just google something like "gay cruising" and then the city or town near you and see what comes up.
Of course that's just for hook-ups, though, as are the aps for the most part. So if that isn't what you're looking for, they won't be much help. In fact it could give you a totally bad experience, so I'm not recommending that.
The problem is being in the closet and feeling fear (and maybe shame) living in a hetero-centric and often homophobic society. You *can* come out little by little. You don't even have to make a big deal about it. (Not saying it isn't a big deal, just that it has more to do with the way you approach it, feel about it and your attitude about it.) You don't necessarily have to announce it, just don't keep it so much a secret. The less of a 'big deal' it is to you, the less it will be for anyone else.
Others have said it and it is true: You need to meet gay people in real life (and hooking up is not the best way to do that). If there is some sort of social club or something, that might be a place to start. You might not feel totally comfortable at first but that's the way it goes. Just don't let your fear get the best of you.
Take baby steps. Every day do one little thing that lets you be more yourself. It could be anything. For example, pick a t-shirt you already own that *to you* says "I'm gay" (it doesn't have to actually say this, its just the way you think about it for yourself) and wear that t-shirt. Probably no one else will 'get it' but you will and that's the point. Buy yourself some sexy underwear and put those on. No one else will see them, but you'll know they're there. Or, better yet, go commando (if you find that sexy)
and let *yourself* feel the sexiness of it. Again, it doesn't matter if anyone else even notices. This is for you.
Whatever makes you feel sexy, more powerful, stronger, more sure of yourself, more 'ok' with being a sexual human being and specifically a gay guy. Just let these little things become more apart of you. People might not notice right away but you're sending the message and, trust me, you WILL get noticed ;)
Next lesson will be learning what attention you want and what you don't and how to manage that! haha. But w/e, one thing at a time.