Any genuine advice on getting over guys you were never with?

I am a high school sophomore. The two guys I like are A (17) and B (18). B is an exchange student. I spend a LOT of time with both of them, and we're all in the same extended friend group.

I've liked A since September of this year, but he's gone to two dances (including prom) with a mutual friend. He also told another friend that he doesn't like me, but knows I like him. A doesn't know that I know about that conversation, though. Anyways... He knows that I like him, but still treats me like he would anyone else (which is honestly great. I appreciate it a lot), and actively seeks me out on the daily. A gets asked out by different girls every couple of months, and he's annoyed by it. That's why I haven't made any moves all year. I hate that we can't be more than friends, and I hate that he acts so nonchalant all the time. I hate how he pretends he doesn't know. I hate that he likes another girl, but at the same time I haven't done anything besides make him cookies and compliment him every once in a while. The rose tinted glasses are falling off, though. I just wish they'd fall off faster. My friends say I could have a good chance of getting together with him if I tried, but I don't want to lose him as a friend.

Now for B. B is an exchange student. He goes back home in 2 weeks. We just started getting closer in the last month or so, and I fell so fast. He went to a prom after party (I wasn't allowed to go since it was late and I'm a fairly new driver). Long story short, everyone got drunk and B made out with the host, (I'll call her C) for like half an hour. They don't know I like B. No one knows I like B. C has a history of getting with with exchange students. I'm very upset because B had been getting really close to me on Friday. Like, physically close. We were in open areas and he still stood inches away from me. I thought something could've happened, but no. Oh well. 2 weeks and I'll never see him again.

Long story short I need to put myself out there if I wanna pull. It's not like I'm ugly or mean (at least I don't think I'm mean), I'm just not the type of girl to flirt unless I know he likes me already. I get flustered really easily, but I'm loud. If you read this far, thanks for listening to my giant self pity rant. Feel free to drop any tips for getting over guys you were never with, or tips for putting myself out there and being less awkward.