I understand what your saying, but I'm not going to tell him something that I know will make him feel bad.
This is a prescription for trouble ahead in your life.
Trying to be nice and doing something you don't want to do, to be nice, is simply unwise. Listen to yourself in the future - please. It is best for both. Faking enjoyment is a wrong road.
You may enjoy all of that in the future, even greatly enjoying it, but you don't just now. Don't act as if you do.
You could learn to be polite while saying no, but no
is the key word, as is yes, if you feel like it. Don't mix those up.