Best friends but more to it

Kali

so im a freshman in highschool and my male best friend and I are really close. And we both have some type of more than just friends feelings for each other. I want to be with him. Like in an actual relationship because my family loves him and everything else but he has a girlfriend who doesn't know about me. and I have a lot of male attention because I look a lot older than my age. I told him I have strong feelings towards me and when i asked how he felt he said "I love you like a best friend but it's more too it than that" I feel conflicted because I want to be with him and I think he wants to be with me but I don't want to make him choose and everyone flips about our age difference when I don't really hang around people my age. And I don't exactly know what to do.