The thing is that your are still too young (unless you are a 40 years old man who likes telling everyone he is 15 xD), dont worry about making something stupid, just do it, now you may give it a hell of importance but in a few years you will think about it like "dude, why did i worry about that?, it was just a stupid thing". So if you have to say something to somebody, no matter what, no matter who, just do it cos that is the way you mature. I dont really know how to say it in english but; if you have to "crash" with something (girls, friends, whatever) do it earlier and you will know how to act in the future. The only way you grow up as a person is learning from your mistakes, they cause more impact than other guys's ones, and with that I dont mean the thing you are thinking about doing is a mistake xD, just that do not fear facing your problems, or they will keep following you forever.