I'm getting so frustrated with this!

So I went to the YSA Summit Conference this weekend and it was actually really fun! I took some fun classes on dating and on some spiritual stuff as well. In one of my dating classes, a guy I really liked was sitting behind me. I talked to him and his friend for a little bit. The class started so we stopped talking, but it was really awkward having this guy sitting right behind me. After the class had finished, the guy asked me how old I was. Now this guy is in my ward and he got my number a few weeks ago. He called a few times, but nothing ever happened. He added me on facebook and I knew he was a little older than me, maybe 26 or 27, but I tried really hard not to let him know how old I was. He asked me after the class how old I was. He guessed about 21, but when I said no, he asked if I was younger. I told him yes and that I was 19. He got really freaked out and I asked him how old he is. He said he's 30. I was a little freaked out because he's a lot older than I thought he was. In truth, I still wouldn't mind dating him, but I highly doubt that he'll ever call me again now that he knows how young I am. This is so frustrating because this has happened more than once. Guys think I'm at least in my twenties and they flirt with me and even ask me out. Once they find out I'm only 19, they freak out and never call again. I also don't seem to relate well with guys closer to my age. I guess I'll have to wait a few more years to be more in the same age group as these 30 year old guys.