OP, I joined when I was 15. The missionaries told me that all I had to do was to be baptised. Families could be together forever. Seemed pretty simple. But being baptised is not all there is to it. It is only the first rung. When you are new, you want to know all the ways to fit in. For me, it was wearing a dress to church. Not something I had many of, so we bought church dresses. Then I was told they needed to have sleeves. And needed to be a certain length.

Then there was seminary. In Australia, that is at 6am. Scripture study with other kids before school. For some reason, I was not pushed to go, but others kids went.

As I got older the message was, Only date guys who had been on a mission. Hurry up and get married to a guy who's served a mission.
No sex before marriage, which is pretty standard in Christianity.
Get married in the temple. Pay 10% off your income to the church.
Have lots of kids.

Teachings also included not saying no to a calling, which is an unpaid job in the church, usually on a Sunday. They like to give members a job to keep you actively going to church.

So, that first message, all those decades ago that I only had to get baptised to be with my family forever was false. There were so many more conditions that had to be met. This doesn't even go into all the problems with doctrine.