Originally Posted by
highrpm
I ride a stock Trek FX 7.4 hybrid on 32 tires and a flat bar.
I'm going to go out on a limb here and say that it is the bike.
I had that bike (or maybe the next increment up), and it really was a mistake for me. I gave it to my daughter's flute teacher, and he likes it. I am older and less fit than you are, so my numbers would mean very little, but the difference between that bike and a good road bike are rather extreme. As others have suggested, even if it gains you nothing in speed, it will still gain you quite a bit in terms of enjoyment.