Am I overreacting or is my sister weird around me?

Am I overreacting or is my sister weird around me?

It all basically started when we were super young. She would always demand we changed in front of eachother and slept in the same bed. I hated it but was too young to say anything about what was happening. She would always get offended when I said I didn’t want to change around her so I had to obliged. That only stopped (the changing in front of eachother) when I got old enough to stand my ground (only like a year or two ago). She would guilt me into giving her things constantly and tell me I had given her something when I had no memory of doing so.

The part that she still does to this day? Slapping my ass. And I fucking hate it. It’s so uncomfortable and I told her to stop only for her to continue a few months later. She has this obsession with just touching me and it makes me wanna puke. She also constantly hits me despite that being one of my terms for us speaking again.

She still wants to sleep together on vacation. She still hits me. She still touches me.

The instance that made me wanna write this was earlier.
I had just gotten a new swim suit and for clarity, it’s revealing. The chest is just covering enough to not show my nipples (ew I hate that word) and the rest of my tits but the entire front is open and the back is also open. I felt like a diva in it because body positivity or something but I ask my sister how I look. Her answer set off my alarm bells.
“You look good. Like really, really good.”
Her tone was so disturbing. I kept my distance and looked over my shoulder to see if she was starring at me. I have no idea if it was just me making crap up but I could’ve sworn she was gazing up at me a lot.

So, I ask you, am I overreacting or is my sister really up to something?