I respect that you want to be sure that the Catholic Church is the one true church. It is. I know that because Christ founded the Church to be One, Holy, Catholic, and Apostolic, that is, He wanted all of us to be one, even as He and the Father are one. He didn’t mean for us to belong to some denomination, but to the Church that He personally founded on Peter, the Rock. He made the Church Holy, that is, He sent the Holy Spirit to remain with us until the end of time, to guide His Church so that the gates of hell would never prevail against it, and they haven’t for 2000 years, and He promised they never would. You won’t find another Church that goes back to when Jesus Christ was here. He told His apostles to go out to all nations, that is to make His Church Catholic, universal, so that no matter where you went in the world you would find the Holy Sacrifice of the Mass, the same sacrifice celebrated somewhere in the world at every hour of the day, 7 days a week, 365 days a year. And He made it Apostolic, so that the Church could be traced back to Christ and His apostles, that there would be an unbroken line of succession to the beginning.
He gave us the sacraments that other churches don’t have. In particular He left us the sacrament of Holy Eucharist, His very body and blood.
I love being a Catholic. I could speak to you of its beauties all day, but I hope you will at least speak with the local parish priest, come here often, and listen to EWTN radio, especially Catholic Answers Live which is on every afternoon from 6:00-8:00 pm Eastern Time. You will get answers to many of your questions in a short time. Before long, you won’t be afraid. You will know the Catholic Church is where you belong.
God bless you.