Only 2 years riding? Agree with see the doc to see if you might have asthma, bronchitis, whatever physical problem that might cause you to get winded. If nothing there, learn to breathe correctly while climbing (probably thought you were, right?) And are you riding a heavy or light bike, with decent low gears or not so much? I'm a bit older than you, ride a road bike around 25-27 lbs. with my seat bag, et.al. Rode 26 miles 9/11, of which the first 7 miles or so were hilly-some fairly decent hills. Four of us were on the ride, all in our mid to upper 60's and we were all winded a little on some of the steeper hills, but not to the point of stopping. Short version-see the doc, if nothing wrong, maybe a lighter bike with better gearing, don't forget to breathe on a climb (sounds easy), and work on upping your fitness level.