Of course it's up to you, but I'd give it a bit longer before making up your mind. It'll be just as easy to switch to ff in a few weeks, but not so easy to switch back to bf if you start with the formula now.
I'm also short with massive boobs and really struggled at first for a whole myriad of reasons. My shoulders and neck were agony all the time - not just while bfing - as I was so hunched over when feeding. To add to that, my DS wouldn't feed properly and lost 11 per cent body weight despite my having him latched on almost all day. We did a six-hour feed once, in my absolute desperation. It seemed that he was feeding all day and all night, but it still wasn't working.
I hated it so much I'd dread each feed and often ended up in tears as it just wasn't working for us. Anyway, after 10 weeks of feeding hell (formula top ups, three bouts of mastitis, expressing every three hours, nipple shields, suction to pull out inverted nipples, all sorts) it just clicked. And now he's EBF, gaining weight well, and it's brilliant.
I know this sounds a bit bonkers to say the least, but I genuinely love bfing now. After all that pain and misery, my DS and I are both very happy. I've found ways to prop him up with cushions so my neck doesn't hurt, and he's also become so efficient that he can feed for 5 minutes on each side and be full, rather than closer to 5 hours.
I love being able to feed him wherever and whenever I want, and being able to nip out for the day at a moment's notice without worrying about bottles/ sterilising/ pumping - something that I found a complete pain when I was exclusively expressing for six weeks or so.
As AThing says, bfing is really easy and convenient now. After it being such utter hell, feeding is honestly so quick and stress-free that I can do it anywhere - yesterday, for example, he fed happily in Pizza Express. I never, ever, thought we'd get to this stage.
It DOES get easier, it really does. Three months ago, I wouldn't have believed how good bfing could be, as it was just a source of misery for us. Even though it took 10 weeks to come right, I'm so glad I persevered.
If you stop now then you should still be very proud of yourself for keeping it up for two weeks when you're feeling the way you do. But be assured that it does get easier, it really does. And if you think you'd like to carry on then maybe tell yourself you'll do it for another week/ fortnight/ whatever and then reassess?
Good luck with whatever you decide.