What should I do about this situation with my "friend"?

Ok now I'm sure this is not something to be all that upset and bothered over....but I am embarrassed as f**k right now :/. Me and one of my friends, who is a girl, hung out in her apartment last night and I was feeling kind of frisky, I guess you could say, after a while because she was really more than just a friend almost and she was VERY attractive.. Well I ended up asking her if she could give me some head and she said yeah. So I got all excited and estatic all in my mind that this was going to happen! It gets ready to go down and I'm all excited and had a rush all over me and then......it happened and it was over like that -_-. Not even 10 SECONDS had passed before I was all done. And now I just felt like total S**T afterwards (felt good though haha, but my ego got taken down hard) She drove me back to my place and she kept seeing that I was visibly upset and kept telling me that it was ok and things like that happen. Well what I DIDN'T tell her beforehand that I was a virgin (she never specifically asked me that nor did I bring it up, I'm 19 and she's 20) But she isn't stupid of course, she's a girl and she know's what's really up...but luckily she's a very cool chick like that and even told me that next time hopefully it's goes a lot smoother :) But I'm still broken down though......how should I handle this situation and is there anything I need to let her know next time I see her?