I feel insecure about liking a younger man

He looks like early 20s and I'm 32, my guess is 8-12 yr age gap. I'm nervous how people will perceive me and a big thing for me is why is he attracted to me? he approached me very respectfully and tbh like a GROWN man, I'm not used to that. only time I get that is with men in their 40s. he's very mature. I like him so much, after he kept trying to talk to me, I slid him my number (something I've never done!).

he was getting something off my table and I slid him my number, told him what it was, he asked me who I wanted him to give it to lol! I said YOU. He was so shocked but in a good way. he smiled a little and said "okay...alright". called me THAT day. but I missed it smh

We REALLY like each other. I'm just self conscious

really need to talk about this.