Ditto to what everyone else said. Rabbits generally detest being picked up. Most don't like being cuddled or petted in the same way that a dog or a cat would -- and why should they, they're rabbits, not dogs or cats!
Check out rabbit.org for helpful care information, including diet, and hopefully you can have your bunny spayed or neutered soon, because if he was "house trained" at the pet store, that means that he probably hasn't hit puberty yet and will start spraying pee like a madman in not so much time.
We are as gods to the beasts of the fields. We order the time o' their birth and the time o' their death. Between times, we ha' a duty. - Terry Pratchett.
"Men have forgotten this truth", said the fox, "But you must not forget it. You become responsible, forever, for what you have tamed. - Antoine de Saint-Exupéry