With all due respect, I think it’s a little more complex than just don’t do it. You probably need to feel “normal” in a loving relationship again (that’s understandable), but be careful confusing your needs and desires. I don’t know your situation, but after divorce, certainly some kind of healing must begin.
First, talk to your priest. I encourage you to find out more about the annulment process. There are many Catholics who make quick decisions about annulment based on misconceptions about the true process, and unfortunately leave the Church because of it. In the eyes of the Church, (assuming you were married in the Catholic church) you’re still committed to being faithful to your (ex) wife. Changing that takes time and that means no dating (for now). Don’t get frustrated yet. It might be a hard road to choose, but I think being Catholic is usually about picking the road not so easily traveled. Seek out the path that will be pleasing to God. Pray hard. Trust in God. He will not bring you to, what he won’t bring you through.
You need support of your family and friends, I pray you have it.
Ask questions and be informed about how to make this situation not only better, but right ( in the eyes of God and His Church.)
God Bless!