I also would like to add that while women generally mature emotionally and mentally faster than men in their teen years, and some teens act more responsible than others, and that yes, age is just a number... however there is also something such as life experience: and that may make a big difference, especially to the person who has the most experience. You are still in a highschool environment, whereas a 20 year old either is at college, uni or working. You are starting to discover going out and dating, someone of 20 years may have already several years experience behind them, including sexual experience. Even a mature teen still has different social learning to do than an adolescent of 20.

Not saying that such a life experience gap cannot be overcome, but please do not underestimate it. I wish you much joyful experiences