I went through the same thing when I started commuting but it will get easier. Go a little slower, not balls out. The idea is to FINISH the commute and still feel you like have energy. If you are just starting out commuting and hauling balls all out, that might not be the good idea at first. Remember the point of the commute at first: is to get there safely. Time does not matter at this point. That will change as you get more commutes under your belt (or saddle lol).