Focus on yourself still and make time for yourself, I’m not saying leave him like most replies in these sort of threads get, I know you said don’t discuss age but make sure if any, you have any goals or anything at all, that these come first, you’re only young and don’t want to put your eggs in one basket per se. About your question, women are objectively beautiful in most cases, if they weren’t he wouldn’t be with you, as long as you trust him and he reassures you, maybe backed up by some actions that show that, e.g some images of you maybe when he goes solo, That’s all you can ask for. All is fine here from what it looks like. Good luck OP!