How do I know if I am making the right career choice to be a teacher?

Understand that I am just a college freshman. I started out as a biology major because I wanted to be in the healthcare field but I didn't know what I wanted to do, but now I'm an Early Childhood Ed Major. I loved school as a child, but as I grew older I hated it and always said that I would never be a teacher. When I became a senior in high school I was randomly put into a teaching class that I wasn't too fond of at first but I grew to love it. I interned at the local elementary school in a 3rd grade classroom for a semester, I thought I would hate it but I liked it. I enjoyed spending time with the students and helping them learn. I was intrigued by how excited they are about learning. Anyway, sometimes I wonder if I am making the right choice. I know I'm going to have to explain concepts to students. I'm not really that good at explaining things but I really want to get better at it. How do I know that I am making the right career choice? I see people change their majors on the daily and I don't want to be one of those people who gets halfway into college and decide to change my major.