Need some guidance and reassurance

For my birthday I am planning on going to see a psychic because I saw one before a few years ago and it was fun and I enjoyed it. I wouldn't say I am a hardcore Catholic but I do believe in God and that Jesus has died for our sins. Just recently I stumbled upon information saying that going to see a psychic as a Catholic is a MORTAL sin and I will go to hell for it which has me a bit worried here. My mother already made the appointment and we were going to make a day of it but now I am not so sure and am wondering if I should cancel. I am trying not to do anything too HORRIFIC to end up spending eternity in Hell when I die. It was a pain to get the appointment so I would feel bad if I told my mother to cancel it. I also got some money from other people to pay for it. It is something I really want to do but I am also terrified about turning away from God at the same time. Can anybody help me with this so I can reconcile my emotions? I want to try to stay out of Hell. I apologize if this isn't the right sub for this question.