To what extent is “gaydar” a real thing, and how do I approach a situation where I’m not sure if somebody I’m into is also gay?

Sorry in advance, this is probably a really stupid question.I’m 19, in college and I’ve only recently accepted (about a year ago) the fact that I’m gay, and I’ve only told a few close friends. I’m ready to start dating/meeting guys, but I’m having trouble and I don’t really know how to go about this. I don’t fit the stereotypes basically at all, so it’s not that easy for others to identify me as being gay in the first place. But anyways, there’s this guy who I have a crush on, and I have this weird feeling that he’s gay, a combination of his smile, mannerisms, maybe the way he dresses (generally cares more about how he looks), how he’s always fixing his hair, and he’s really cute which helps too. He doesn’t exactly fit the stereotypes either, but I just can’t explain why I think he’s gay but he isn’t out if he is. So the dumb question, is gaydar real or is my mind just connecting the dots of stereotypes?What the best way to approach this? I would like to try to make a move but I don’t feel comfortable doing so unless I know for sure he would be interested. I asked one of his friends who told me she thinks he could be be wasn’t sure either. It’s just stressing me out because I have massive crush on him and I don’t want to mess anything up or embarrass myself in the process.