It is okay to be pissed about the the game and still be excited about the future.
They aren't mutually exclusive. If the worst thing Cam did in this game is hold the ball a little too long on some plays (something that EVERY rookie goes through) well then the only thing that should be pissed is your pants with excitement.
Yup, he did hold it too long, he's still looking for the big play every snap. I think with time he'll realize that there are situations where taking the underneath route when your back has space between him and a defender IS a big play sometimes.
Overall he did excellent, showed some rookie mistakes but played well beyond what I thought he would and I'm pumped for the future, even if I'm disappointed in our D/special teams.