BIG age difference

Ok so I've never posted in here before so please don't judge me too much if this doesn't make sense. I'm 16 and I don't look or act like it everyone always thinks I'm at least 20 and there's this 33-year-old that works for my dad and we've been in love for about a year now. He doesn't act or look his age everyone thinks he's about 20 too. Does it seem weird or gross that it's a 17 year difference? Please help I don't really have any friends and I really need advice.