There is a guy I want to start talking to but I have no idea how?!?

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So I guess I should start off by telling you about myself. I'm in grade 11 and just turned 16. I've never had a boyfriend and to be quite honest I kind of want one. I mean all my friends have had one and I'm just sitting here alone. I don't usually talk to people unless it's my friends or I have to talk to a person. I have a low self esteem so I don't talk to people or try to be center of attention. There is a guy in grade 12 that I find absolutely attractive and I really want to start talking to him. We follow each other on twitter and I tried talking to him once through DM about co-op and it didn't really get anywhere. He's really helpful though! Lol. I find it weird to just start off a convo with "Hi, how are you?" considering we've never really talked before. Oh we have been in a class before. It was last year and we didn't talk then either... UGH. Please help me... It's so hard...