Can someone pls help me with these emotion-manipulation problems I have with my parents I’m 18 f you can read below :))?

I feel no positive vibes or love at home and sometimes my parents make me feel bad about myself or emotionally manipulated. My mom acts so much differently toward my brother who is 20. She laughs and is so nice to him and then with me she seems unhappy and gets offended by anything I do and makes me feel guilty. Tonight I was being open about how I am upset that the only time my family goes out to dinner or really spends time with each other is when my bro is home from college. My mom got so mad and offended and said that whenever they ask me to do something I go with my friends and not them. But like I can’t go out to ice cream with them cuz I’m lactose intolerant and idk if they forgot. They always ask me last minute when I already have made plans. And I don’t feel comfortable going out with them because my parents usually fight or I just get horrible vibes from them at dinner. I don’t even remember the last time they took me to dinner without my brother. Every convo w my mom makes me sad and I hate seeing that she treats my and my bro differently. My dad is usually mad for no reason or makes me feel bad for relaxing during the summer and they call me lazy. What do I do? I’m really trying to do what’s best for me and control my own happiness but it’s hard.