It’s very confusing to be 19 and like someone when you probably both don’t have a lot of dating experience. So relax. This will all work out. First of all, don’t kiss him first. Let him be the one to go in for the first kiss — if it’s going to happen. Guys love being the ones to win you over and kiss you for the first time, so don’t take that away from him. Also, if you do kiss him, and then nothing happens, you’re going to be in the same situation you are now, but feeling even more awkward. So hold off on the kiss, and if there’s gong to be one, let him lead.
Second, flirting is the tool you can use to get a guy to know you like him. Guys do want to chase — but they need to know there’s something to chase after. Compliment him, talk to him, ask him questions about himself and his life and let him know with your behavior that you like him as more than friends. This will give him courage (guys get nervous about making the first move, often) and you’ll be paving the way for him to ask you out.
I hope that helps!