If you are the type of person who has an intellectual approach to faith, my suggestion would be to learn as much as you can about the LDS faith and deepen your knowledge about the Catholic faith. Emotion and feelings are part of religious experience, but they should not be what carry you or convince you that you are right.
When the Catholic faith and the LDS faith are compared side-by-side there is no question that the Catholic faith has greater internal and historical consistency. The LDS Church has changed many doctrines over the years, not disciplinary rules but actual doctrines dealing with the nature of God, sin, man, and other very fundamental teachings.
When I was in high school, I was, for a time, very attracted to the LDS faith. I plunged myself into the study of it. The more I learned about it, the more certain I became that it could not be true. Mormons gain converts by focusing on those who have some religious background (mainly lukewarm or lapsed Baptists and Catholics) but little knowledge of their own faith or the Mormon faith. Many of these people are drawn into the LDS Church by an attraction to their strong sense of community, family, and admiration for those who are recruiting them. People who say they converted through study or an intellectual, reasoned approach are few and far between.
After my intense study of the LDS faith, I actually taught some classes on it in some Baptist churches (I was Baptist at the time), and I would be happy to assist you in your study. Just email me with any questions you have, and I’ll help you get the answers to them.