Don't worry about rambling or being confused about religion. You're in the same boat with many 8-108 yr. olds. The first steps in finding your way is asking these kinds of questions. Now that you are out in the world on your own it is time for you to learn and work out may things in your life and this is one.
I assume you’re not thinking of being a Buddhist or Muslim or something so I figure maybe you’re asking what Christian religion or denomination you should follow. First what is a Christian? If you ask a lot of people you will get a lot of different answers, but you will mostly get answerer that fall into two main categories. The first will revolve around the belief in a God to some extent and the fact they are not some other non Christian religion or atheists. The second will be what the True definition is. The original term was used for people the believed in and followed the teachings of Christ. They believed that Jesus Christ was the son of God and died on a cross as a payment for the sin of the world and those that believe in this and accept that they are sinners, repent of their sins and accept him as savior will be saved for an eternity in hell and will spend that eternity in the presence of God, the creator of all things. That is what it really means. Within Christianity there are many denominations. They evolved around different beliefs in the area of church government and some secondary theologies or beliefs. These would be secondary the main focus of Christ as the savior. Note that Christ and his original followers didn’t crate different Christian religions or denominations, so as far as Christianity goes, don’t get hung up on denominations as it is not all that important. I am a born again Christian and I can’t tell you what I am as far as a denomination other than I got to a Bible church. I was raised in a Baptist church, but that doesn’t mean much to me.
Yes Christians would probably look down on many things you have done, but true Christians also look down on many things they have done and continue to do. They hate the sin not the sinner. We are all in the same boat here. The Bible says “All have sinned and fallen short of the glory of God.” Life is hard and it doesn't take long for those regrets to pile up for all of us. The most devout Christian is still a flawed human being and far from perfect, and they know it.
As far as what you are, I would say in terms of Christianity you’re lost and searching. Just because you attended a church and got baptized as a kid doesn’t make you anything in particular. Many churches practice baptism as a recognition or association of the child with a church or Christianity, dedication. The Bible is very specific that baptism is something a believer does as an outward sign of their faith. You going to church as a child and being baptized is kind of like your parent telling you what is right and wrong. As an adult you have to figure out what is write and wrong and for a Christian the Bible has those answers.
I have a very good link that outlines the Christian faith with click on Bible verses for anyone that wants to better understand the fundamental core faith of Christianity. It is very informative and lays it out much better than I can.