I was in the same boat as you when I first started riding. I'm 6'3 and was around 260# when I got my F4i. All of my friends that I rode with kept saying I needed a bigger bike because I was too big. So in 3 months of riding I "upgraded" to a 929RR. Thankfully, and luckily, I never got myself seriously hurt. I was always told by my uncle with many miles under his belt to "ride your ride at your pace. It isn't a racetrack. Your goal is to make it to the end of the ride. Not to get there first." That line still rings true to me today. But I wish I'd have started on a different style of bike than the F4i. Something with less power to learn better throttle control. Instead of mashing the brakes on entry then hammering it out of the turn, being smooth with the throttle makes a world of difference. And having a good deal of power on hand doesn't make that easy to learn. Start small. Work your way up. There's a lot of good advice flowing thru this post. Take the time to soak it all in. There's always items available to make riding position better like a set of Helibars or another bar riser setup.
Or just go buy the literbike, and toss it, spend a few days in the hospital (if you're lucky) and then say you wish you'd have started on something with less power....the choice is ultimately yours.....