We began hooking up and having casual, consensual sex because we were just physically attracted to each other. I didn't tell him my age, I figured maybe he knew it or thought I was older. After we started hooking up we actually became friends and began hanging out some. Then feelings developed. Then my age came out. However, he thought I was much closer to his age than i actually am. Whereas I thought he wasn't as older as he actually is. Where do we go now? A 13 year age gap is huge, but I really like this guy.
If you really like him, then I don't see why you shouldn't give him a shot. however, being with someone so much older than you does have it's downsides. You're both at very different stages in life, which can cause a lot of unneeded drama. So just be careful.
Your a big girl now, you can do whatever the hell ya want. But I'm not gonna lie, it'll be tough. You two are at different stages in you're lies right now. Eventually you'll catch up with him, but in the mean time it'll be a struggle. If you think he is worth it, and you think you can pull it off, by all means go for it.
If you got on really well without knowing each others true age, then it shows you were interested in each other's personalities. Finding out ages should make no difference to how you feel. You are dating him, not a number.
Even though you're 18, it still is kinda creepy because your maturity levels are not yet the same. If you were at least in your early twenties, it's not that bad because you start catching up at a certain point but at 18, your brain is still developing.