How do me (F18) and my girlfriend (TF19) have “fun” when we are both subs?

So me (F18) and my girlfriend(TF19) have been together for a few months now, we’ve been having yk, fun. yet its difficult, because she’s a sub and I’m also a sub. yes we can switch ever so often, but she always wants me to dominate, but i also want to be dominated. What do i/we do?