Attracted to a 25 yr. old....need help.

I don't know what to really ask/what the title of this should be, so giving the whole story here should get the question across. So to cut to the chase, I'm a 16 yr. old girl in highschool. There's this guy who is new this year, he's basically a security monitor/hall monitor/security guard. He's 25 years old and his name is Justin. He is literally, sooo hot and attractive it's not even funny. I'm pretty obsessed with him. I would post a picture of him(from his Facebook lmao) to show you all, but I don't want to be creepy.(long story) I know his younger brother who's a senior and his cousin as well(not personally), but they live in a town that is fairly pretty close to me. I also have two close friends who attend their school and even know him. Justin is also in charge of ISS(in school suspension) at my school and he spends the day in a room with whoever student(s) has it. Plenty of other people think he's hot, I'm sure, I know a few. When I see people talking to him, it's mostly school related, I get so aggravated and jealous....all because I'm too shy and nervous and get way to scared. I haven't been diagnosed, but I most likely have anxiety, it's awful. My friend who's a senior has talked to him briefly, and she tells me I should go for it, but I constantly chicken out whenever I plan the day on doing it. She doesn't talk to him that much like I said it's brief, but because her friend she tells me talks to him a lot. Her friend literally told him that he's so hot haha. Wish I had the guts to say that. But anyways, he clearly knows I like him because of my actions. We make eye contact(when I walk by, when I'm in class looking out the door into the hall, coming into school seeing him at the front desk, etc,.). He checks me out and of course I do the same and I think he notices it. He will stretch and I will be walking his way. I do look A LOT older than I am, and for a 16 yr. old girl in my grade, I'm pretty mature. I'm friends with a few 20+ yr olds from the sport I do(horseback riding) so yeah. Luckily, last week, I finally got the chance to talk to him. Wasn't the best but I knew that I needed to set a time limit. It was getting to that point. So I did, but it was awfully awkward and pathetic. I walked over coming out of the middle of lunch when hardly no one was aroun and said "hey" to him. No where near my actual, comfortable voice. It was a shy "heeeyy". He was on the computer and turned around and just looked at me in the eyes so I said "I have a question"(already knew the answer to it). He said "and I may have an answer", while typing on his computer. Then I said "where do you get the work permits?" And he was like sorry repeat that because I was talking fast. Then he said guidance and I was like okay thanks and I think he said no problem but that was it and then i walked away and went to guidance kind of shakey and nervous recovering. The rest of the day was awful because i couldn't get that fail out of my head. But I realize good thing was I set a time limit, and I did it. I went and got it done despite how much of a fail it was. Fortunately, at the end of the day nothing wasntuinedband we made eye contact again, just like no mistake had ever happened. And ever since then, it's been like it almost never happened like he forgot about it completely. But now my goal is to talk to him again, and keep a conversation going and not get awkward or nervous. He's really a nice guy, I just need to push myself out of this comfort zone. :/