Most Helpful Guy
More normal than you think. A good amount of girls in their mid teens (15-17) are attracted to men who are 18-24, and vise versa. Just how human sexuality has always worked and continue to work.
Now, while some of those guys would be okay with having sex with a 16-18 y/o or whatever, they might not be okay with a relationship. Generally a 16 y/o girl has much different perspectives and desires of relationships than a guy in his early 20's, who may be getting ready to settle down.
Most Helpful Girl
Yeah, it's normal because guys mature later than girls. So you probably think that guys your age are pretty immature, but I'd say you should go after them instead. There are mature guys your age too. The older guys can use you, and your n different stages of life. When he wants to go out, you can't go with him to clubs/bars and so on. Just wait.