How do I deal with a toxic parents and aunt

Few months before I stopped talking to my mom, I use to confide in her about my problems with school, life, etc. I stopped talking to her because all my problems that I tell her, she tells it to my aunt from my dad's side. The thing is I don't trust my dad's family because they are manipulative and overbearing. It's unfortunate that my mom just allows them to treat her, me, my brother and my dad this way. My aunt is deceiving at times and has taken advantage of my family financially when she has the chance. My mom would tell my aunt my problems, my goals, my view in life, later on when my aunt and my cousins come over for special occasion, my aunt would just kind of throw it at my face and make me feel stupid. I feel humiliated in front of everyone. I feel this way every after we have this get together with my dad's family. My aunt always treats me like I'm inadequate in front of everyone. She is always implying that I'm a bad person, and that I make bad choices in life. This of course makes me feel like I am. But I know I have not done anything hurtful to anyone in my family. I feel strong about the decisions I make and if I make mistakes, it's okay because they are my own mistakes. I'm beginning to think that because I'm starting to be independent and have a mind of my own, they are trying to undermine me. I've been doing a lot of self-reassessment and reflection and I really can't help but think this way. I know my mom raised me and I do love her but she can't even defend me from my aunt. It seems like she has no problem seeing her daughter being put down by her sister-in-law. I don't understand why they would do this. All I want from my mom is to be more understanding, accepting and some advice but instead she would tell my aunt on the phone and I get criticism instead.
I really need help how to deal with this. I don't want to live in an environment like this anymore because I'm afraid I would become like them. I'm starting to lose my self-confidence because of this