First, let me say welcome to the asylum!
Next, your body and intuitive sense of balance are adjusting to using muscle groups in new ways, so some of what you are experiencing is, to coin an explanation, "new rideritis." It can take a bit of time and tweaking to find the mental - physical - soulful "sweet spot" that assures the physical part of the ride is effortless.
But not all of it is due to new rider adjustments. I've been riding 40 + years and had to do several things to get the VStrom ergos right for me.
to relieving the physical part is to get to a relaxed, neutral seating position, and the single purchase you can make to achieve this is a correct set of bar-backs / handlebar risers.
So here is a trick I read about years ago that will let you work your way to this without repetitive or expensive experimentation.
1. Put the bike on the center-stand if it has one, or if not, get a few "strong-back friends" to help you hold it upright and motionless with you seated as if riding. (If using friends with the wheels on the ground, put it in 1st gear to kill a "roll factor" that will spoil the sense of security.)
2. With your feet on the pegs as you usually ride, sit "as if riding upright" in a neutral, relaxed position that puts your upper body weight substantially over your hips. A slight forward lean is okay, but avoid any hint of a backward lean. (I.e., you want your spine comfortably straight, and not bowed or humped).
3. With your elbows slightly bent, hold your arms and hands out to toward the handlebars and note where your hands would hold the grips at that natural resting point.
4. Have someone measure two distances: "up and back."
The goal of this of course is to identify how much rise and set-back to purchase in a set of bar-backs. The measurements do not have to be to the 16th accurate, but they do need to be in the ball park. Record the numbers so make sure you have the up and back part of it correct before you order.
The ROX variety riser / set-backs that allow adjustment in the up/back settings are the most expensive, but they likewise allow flexibility for a fine tweaking as needed.
Finally, I feel your pain. I'm 5.6" tall with a 29" inseam, and a slightly short reach. I've used this trick on several of my previous bikes, and until I got it right on the VStrom I would get a tight neck and knot between my shoulder blades after after 25 miles on the road. I used the steps outlined above to identify my sweet spot and bought the SW Motech 33mm rise / 22mm back, set-back type risers.
Enjoy being young! From where I sit at age 62, I can assure you that even with the ergos right, if I rode 3,000 + miles on my VStrom my hands, arms, and perhaps my whole upper body would be so numb I would have to be pried off the bike.