i'm always the friend. and never the girlfriend..help?

[iceprincess x12]

overall, im a confident, pretty,funny, and very nice 16 year old girl. but when it comes to boys, im definately a novice. i've had 'things' with guys, but when they want to start to get physical, i chicken out..to be honest, ive never even had my first kiss yet. i like this boy, and my friends have talked to him about me, and he said 'i dont really see her as more than a friend" im not seen as 'one of the guys' and i'm not a tomboy but ive always had guys as best friends. also, my friend told me that he's not looking for a gf right now and he likes being single. i've liked this boy since the middle of this school year, and he's yet to notice me as the 'girlfriend type'. we talk but it always seems very..friend-y if that makes sense. but i'm really looking for an answer as to why he sees me this way. and is it a possibility that he thinks that he will be rejected if he tries to take it a step further with me? [guys, i could really use your help on this one!]
i dress perfectly fine, like a teenage girl would. not like a skank, and not conservative. and im not at ALL pushy with guys.