Should I add him on Facebook?

Okay, I’m just going to go straight ahead and explain the whole story. This might sound really silly, haha, but I’m really shy and genuinely don’t know what to do! I have had strong feelings for this guy since I was 12 years old; I haven’t looked at another guy since, and I’m now 17. He’s single and is three years older than me. I’ve known him my entire life, but it’s mainly through other people; we’ve only spoken face-to-face a handful of times and even then it wasn’t serious conversations. But he knows my mum and my brother and is very friendly with them.

I found him on Facebook when I was 13, but didn’t add him. I also found him on another website, I think it was Flickr or MySpace, and added him as a contact; he then added me and classified me as a Friend.

I saw him at this get-together recently, and at one point he was stood alone not talking to anyone. I badly wanted to go and talk to him, but I was too shy. Now I regret not speaking to him, because if I had then I could easily add him on Facebook. At this get-together, it was announced that he and his best friend had been abroad to help out in a poorer country, which is something I want to do.

Should I add him on Facebook? I’m worried that despite us being friends on Flickr/MySpace, he may not recognise me or my name. Would it be weird for me to add him on Facebook and ask his advice about doing charity work?