Scott makes some excellent points.
Do you have a windshield? The windshield will help keep some of the wind effects off of YOU, which, in my opinion, really helps you handle the wind on the highway.
I've ridden the 900 for 20,000 miles now, many of those miles on interstate highways, more than once for several hundred miles at a time on the super slab! I'm not going to sit here and tell you it was the best machine for the job. But I'm also not going to sit here and tell you that when I got off it I thought "Gee, wish I had another bike". You get used to the wind after a while.
Cheesefood, how well do you understand countersteering? Everyone countersteers, but a lot of people aren't aware they are doing it. Making a habit of being conciously aware of your countersteering 100% of the time (not just heaving the bike) will REALLY help in the wind. You'll learn to get a 'feel' for applying grip pressure when the wind hits you or the Semi blows by. Eventually you'll get good enough that you can instinctively press on the grips just right and pretend like nothing ever happened!
I'll also second the advice to find a secondary highway. There is a 60mph divided state highway, with periods of very low traffic, near me. That's where I first opened it up to highway speeds, same with my wife. It's easy to do 65 or even 70 on those roads without attracting any unwanted attention, but it's without all the traffic. You get used to the speed, THEN you can start jousting the half-asleep zombie drivers on the interstate.
Don't give up on it though or let anyone tell you that your bike can't handle it. One day I'll have a bigger bike, because what I like to do is travel and do long distance riding and the bigger touring cruisers are built for just that. But, the 900 has been MORE than adequate for two-up loaded-down highway trips in heavy wind and thunderstorms, and I'm not in any hurry to make that jump. It absolutely can do it, and so can you, just give it some practice!
I always think of riding a motorcycle on a long trip as like camping. I COULD stay in a motel and be in a warm bed with cable TV, but I have that at home the rest of the year. I ENJOY getting out in the elements and pitching a tent and roughing it a little. In the same way I could sit in the leather seat of my 4 door sedan, turn up the 8 speaker stereo and crank the A/C or heat or whatever I need. But that's how I get to work (in the winter) the rest of the time. I enjoy roughing it a little, getting a little wet, feeling a little wind, even getting blown around a little or being a little stiff in the rear-end when I'm done. IMO, dealing with wind and rain and all that junk is well worth it to be out there on the open road on two wheels!
-John