I definitely echo others’ sentiments that you should try to accept it. If you know how and when you’re productive, use it. Is “making yourself a morning person” the hill you really want to die on (aka spend all your time and energy on changing)? Accepting things like this about myself is something I’m still working on too.
I’m actually the opposite. I’m a middle-of-the-day person, and after working regular 8–5 jobs for years, as a home-based contractor I make sure to keep a rigid schedule during business hours. If I don’t, and try to work in the evenings, nothing gets done!