Probably the only aircraft you would have trouble with would be the older ones, and then just briefly. We had a petite FO on the Convair 240 that had a bit of trouble when landing empty, but she made it work. In this day and age, you are unlikely to fly anything older than seventies vintage, so as long as you make good friends with the trim (and I doubt you will obtain a commercial without doing so anyway) you should be just fine. Spend your time worrying about the economy and finding an ethical employeer instead.