Trying again later is ALWAYS an option. In fact i've found from personal experience that it's a hell of a lot easier to just wedge your way into the girls heart from friendship to relationship. You just gotta be the kind of guy she's typically attracted to. This might mean changing some of your behavior to become more attractive in her eyes, but you do what you gotta do. If it's a radical personality change, drop it and go try your luck elsewhere. No point in suffering meaninglessly while you try being something you're NOT - even more so when it might not even work. But little changes here and there, trying to become more attractive in her eyes, that's something easier said than done, but it's overall not at all very complicated. Girls have hormones, too, they get horny too, in general, they like funny easy-to-talk-to guys that listen to their problems without complaining, but don't always say what they want to hear, they give honest advice and they're present, but not in a needy sort of way. You gotta have a life besides her or else she's going to friendzone you forever. If you do have a life besides her and you make it clear that you have one, she'll be more attracted to you. Especially if other girls start showing interest in you as well.
So chillax, don't beat yourself up, don't try to be something you're not but try to live up to the girls expectations, try to be there for her but not in a creep way, and you're golden. Girls ain't blind and they see when a guy is worth it. You just gotta show it.
Go man!