My fiancée [21F] and I [20M] are having some disagreements.

My fiancée (21F) and I (20M) have been together for two years, and our relationship has always been smooth, filled with laughter and a carefree attitude. However, after I recently moved to another state, everything has changed. I wanted her to join me, but the condition was that we had to be engaged, which I thought was a reasonable request. We've been living together for a little over a month now, away from her family, and my perspective on our relationship has shifted significantly. Upon her arrival, the first thing she mentioned was that we needed to get married right away. I brushed it off, thinking that our plan was to buy a house, establish our careers, and then get married once everything was in order financially. Then she expressed a desire to have children soon, which is concerning since we can barely support ourselves, let alone a family, especially without even securing a home yet. One day, I came home to find out she had been on the phone with her mom, and they decided not to move here after all. Now, their new plan is to live with us for three months after we buy a house, then return home for another three months. This isn't what I envisioned when thinking about owning a home; I want a place for my future kids and wife, not to accommodate her family for half the year without knowing if they'd contribute financially. Recently, I started looking for higher-paying jobs to ensure I could provide for our future family, but she expressed concerns about me working two jobs during this transition. Her parents have not been financially responsible, and they've never taught her about credit, which worries me. For instance, her father is asking her for help with his credit, yet she's inexperienced herself. I fear that they might become a burden on us, especially since she tends to glorify her family despite their financial instability. It’s also hard because I sense irritation from her when I spend time with my brother, who is doing well and serves as a positive role model. I’m truly seeking advice here. We just got engaged, and she relocated 1,500 miles away from her home. She’s a wonderful person, and I love her, but I feel like my life is taking an unexpected turn. Another issue is her perceived immaturity; she gets upset when other girls talk to me or when I receive compliments, even though I don't seek that attention and she knows it. Additionally, she has a tendency to criticize those around her for minor things. I’m unsure if I’m just venting or if there are valid concerns here. I really don’t know what steps to take next.