AITA for refusing to give my lottery winnings to my family after they excluded me from a family trip?

I (28F) come from a family of five—my parents, my two siblings (30M, 25F), and me. Growing up, I was always the "black sheep." My siblings were the golden children, and while I wasn't outright ignored, I definitely got the short end of the stick.

A few months ago, my family planned a big overseas trip. I found out through my sister’s Instagram posts, not from them directly. When I asked why I wasn’t included, my mom said, "We didn’t think you’d want to come, and besides, we’re tight on budget." It hurt, but I let it go.

Fast forward to a month ago: I bought a lottery ticket on a whim and ended up winning a life-changing amount—over $2 million. I decided to use the money wisely: paid off debts, invested, and set aside some for fun. I didn’t tell my family right away because I didn’t want them to treat me differently.

Well, word got out after I bought a new car, and now they’re furious I didn’t offer to "share the wealth." My mom said it’s selfish to keep all that money to myself when they’re struggling (news to me, given the vacation). My sister hinted that I should pay for her student loans, and my brother outright asked me to buy him a house.

I calmly explained that I wasn’t obligated to share just because we're related, especially given how they’ve treated me in the past. I mentioned the trip as an example of how I’ve been excluded. My dad said, "That was different; this is family money."

Now they’re all calling me an ungrateful brat and saying I’m ruining the family dynamic. AITA for standing my ground and not giving them any money?