Hey mate! It's your 5th time and you're already kclosing this is very good. It may took a while till you get to fclose however. But if you keep it up it will come. Don't worry about blow-outs, everyone gets blown out. There's not a single playboy on this planet who doesn't.
Now for this situation... I think you were a bit fast with this one. It was a very nice try btw and you can be proud of yourself for actually trying it. Most guys are just stuck without trying and wondering wether it would have worked or not but you just went for it and that's the attitude you have to follow. If you continue like this, I doubt that sooner or later there won't be some chick who will be glad to have you inside her
Besides there could be a hundred million and more reasons she rejected. It is even possible(altough, knowing bitches not too likely) that she really needed to work the next day and had some important stuff. Don't even bother that... Just keep going! Cheers.