So I made my first Confession this Saturday. I guess I had imperfect contrition at best or maybe I just didn’t have an enveloping fear of hell. That can seem like remorse. The reason I say this is that I remembered a few things afterward that I forgot to confess. Do I just go back and confess them, even if I don’t feel an overpowering emotion about them? I certainly don’t intend to do them again, but I’m just so used to the overriding fear of hell that when it’s absent I get slack on things. What do you think?
First of all, congrats on your first Confession and welcome to CAF!

God’s grace and forgiveness is an awesome thing!
Especially seeing as how this was your first Confession, it is very understandable that you would forget a few things. As much as we prepare ahead of time, forgetting things is something that happens to all of us from time to time!
So long as you did not
deliberately fail to confess
mortal sins, you are in good shape. Your Confession is valid and your sins (even those you forgot to confess) are still forgiven.
That said, if the sins you forgot are mortal sins, you should make the effort to mention them in your next Confession. Not that those sins aren’t already forgiven – they are – but it’s a good habit to get into. If you have any doubts as to whether a sin is mortal or not, it never hurts to bring it up just in case (unless you suffer from scrupulosity) and even seek clarification from the priest in that regard.
Also, although emotion can be associated with the Sacrament of Reconciliation, it is not necessarily so. We don’t have to
feel forgiven or even
feel sorry in order to go to Confession and receive those great graces. It is enough to know that we have done something wrong and have that firm intention not to sin again.
Again, welcome and congratulations.
EDIT: I just thought of one more thing.
Most of us only have imperfect contrition when we approach the Sacrament of Reconciliation (and fear of hell is a form of imperfect contrition – perfect contrition means being sorry
solely because we have offended God). However, imperfect contrition is enough
when we use the Sacrament. Perfect contrition can take away our sins in the absence of the Sacrament, but that is not the situation the vast majority of us find ourselves in. So don’t feel bad if your contrition was imperfect.