Please help

Gay teen asking for some advice. Before I start, I just want to give a brief backstory about myself. I'm a gay teen that hasn't come out to my African american family (don't feel ready; very religious), but that's not the concern. I've never really had a boyfriend and lately I've been wanting a relationship for the past year or so and I don't know what to do. It's like every time a guy looks at me for a second longer than they should I'm in fucking love and I KNOW that isn't rational thinking, but I can't do anything to stop feeling this way. I'm currently "crushing" over this senior (btw I'm a junior) at my 8th grade sister's upcoming high school. He was our tour guide and halfway through the tour he was looking at me (like a tour guide is supposed to), but it seemed like he was glancing at me like he was interested or something. Lol, did I mention we go to different schools? And just so you know how close-knit this tour was, it's 4 people (My mom, my sister, Jesse (the tour guide), and I). Anyways, the rest of the tour I would avoid his gaze when he looked at me and I would try to stand away from him when we would be really close to each other because I'm shy when it comes to stuff like this. Oh, and just so you get a taste of how awkward I was being:Our hands almost touched when I was coming through one of the various doors he would open for my family. I stepped away and put my head down.Speaking of doors, he was a gentleman and opened every door we went through. My sister and mother would say thank you and I would say nothing and just look away from him. Btw, the doorways were very narrow and we'd be like inches away from each other. I did say thank you a few times, but it was very silent and I personally think I came off as a weirdo. Now I know you're probably wondering, "What the fuck does this kid want, to share his life story? What's the point of this?" To answer the question you may or may not be pondering, my sister will be seeing him in a few weeks because her band practices with his and my loveblind, irrational, heart thinks I should tell her to send a message. I wanted to know, am I fucking insane for thinking that some random stranger is gay, let-alone interested in me just because he glanced at me longer than people usually do? Should I just go with my heart or some shit like that? Please help...I'm lost.tl;dr Closeted gay that's never had a boyfriend. Saw this cute guy that I think may be interested at me because of an encounter I had with him. My little sister will be seeing him and I'm wondering should I send a message or something.