How can I look older

So I am 24 years old. I look younger than my age. I am 5’2 and I’m thin. I sometimes try to wear more makeup and dress up when I want to try to look my age. But when I’m not wearing makeup and I’m just in a hoodie or whatever, I can look younger.

I have a bf. We have been together for 4 years. He’s 25 years old. He looks his age.

Sometimes when we are out , people say I look like a teenager and he looks too old to be with me. It’s so embarrassing. It makes me so insecure. A long time ago, a guy said I look like I’m 12.

Any advice?