Let me say, as a girl, you guys are worrying about something very unimportant. First of all, having been responsible for a great number of ejaculations from a decent number of guys, there are very few - and I mean very few - guys who have the firehose. Most guys do a few spirts, some shoot farther than others. But most of the firehoses you see in porn are fake. As I'm thinking about it, and all the blowjobs and handjobs I've given , I can remember maybe one or two that standout as huge loads. Most guys do a teaspoon or two, tops, But thats OK. But the guy that stands over his girlfriend and literally covers her tits or back or face with what appears to be a cup of cum? Really. Sorry, no. I have found the biggest variable to be how long its been since the last time you came, and how long you have been "hard" in your current situation. The same guy can vary 50 to 100% under those conditions. My own bf, when he's gone on a trip and is celibate (and I mean he intentionally does not erk off or anything) for a week or so - when he comes home and I "greet" him, he cums a lot, and the orgasm is intense. The afternoon quickie that you squeeze in at lunchtime when you have 10 minutes - or the bj on mom's couch when no one is around - not a huge load usually.
Bottom line - there is no judgement connected to your cum volume, the speed of the spirts, the distance they travel or how many there are
As far as I am concerned, with my bf, and all the guys before him and those who will probably follow him, he is spending his time paying attention to me, entering me, loving me and giving me his entire amount of semen to do with what I want. He doesn't hold anything back - I get him in totality.
Enjoy your girl guilt free and free of fear. If she truly has a problem with the "size" of your load, dump her, she's better suited to be a porn start than girlfriend.