Sister is against everything I do

I’ve been going out with my boyfriend for a year and we’ve gone ring shopping and have just put down a deposit to rent a house together (I have one year of school left). Even though we went ring shopping we know we aren’t gonna get married for a few years, it was just a fun thing for us to do and he got an idea of what I liked. I only told my mom because I was excited and I’ve never wanted to get married before being with him. My mom my three sisters and two were happy for me but one keeps texting me and calling me because she’s against all of it. She told me that I’m going to regret moving in with him and that I’m supposed to be with my friends because they are a support system. Which I get like yeah most people live with their friends in college but mine are all ahead of me and will be graduating before me and it’s not like I’m going to cut them off. They are going to live near the house we got so we can visit each other all the time. Then today she called me and said that marriage is just a piece of paper and that people shouldn’t get married until they want kids and that I’m too young and I still have a lot of growing up to do after I graduate and get a job. I agree with that I still have growing to do but who doesn’t? Just because I’m with him doesn’t mean I won’t be able to grow, if anything we’d grow together. I’m just frustrated because she’s pushing her opinions of relationships on to me and I’m just trying to do what makes me happy.