How can I get out of the friend zone and into his life?

okay, so I am utterly in love with my best guy friend Brandon. I've felt this way for about five months now and it is so unbearable. The problem is, no matter how much I flirt and try to be seen as a girlfriend, all I ever am is a friend. i am constantly being told I'm pretty and nice, but I'm worried I've been to nice. i support him all the time, even if it's about another girl and he knows I'm in love with him. today he asked out my other best friend tayla and she likes him too, but no nearly as much as i do and she admitted that. I just can't stop crying. I think about him constantly and worry about him. I just love him. How can i appear more as a girlfriend and not a friend. i don't want to ruin their relationship, but just for future reference. i mean I flirt and dress up and look my best constantly to impress him. I am outrageously nice and talk to him all the time and we share everything. I just don't get it. we write songs together and hang out all the time. I don't know what to do. Should i like... IDK man... I just need help. I'm so lost and upset right now. :/