To feel guilty finding teenagers attractive

[EDIT: to be clear I would NOT actually pursue someone I knew was under 18]

I live in an area near two sixth form colleges (mostly for 16-19 year students) and a university, and honestly, as a bi girl, I see a lot of cute students of both genders. The issue is (although people tell me I look 16/17) I'm really 22 years old with a graduate job and I'm starting to feel like a creep.

Just the other week I went clubbing and made out with a gorgeous girl, who turned out to be 19 in her first year of uni. Although in that case it's only a 3 year difference a part of me was still thinking "What have I DONE?! Am I officially an old weirdo?"

Yesterday I was helping my dad move some sacks with a wheel barrow outside my house. I was being awkward and clumsy, taking up the whole pavement and blocking the way of this beautiful short black haired girl wearing a rainbow jumper (which *can* be a kind of signal you're LGBT), anyway as I un-gracfully hauled the wheel barrow out of her way and gave her an apologetic smile, she smiled back at me and all I could think was, "Wow, you're beautiful" before my voice of reason chimed in with, "She also looks 16, stop being strange!".

I understand that a 3-6 year age gap isn't the biggest thing in the world, but it's more the maturity difference I'm wary of. I'm also slightly scared of what it says about me, am I stuck mentally in my teenage years?

So does anyone else in their 20s feel the same awkward guilt?