I think I might be adopted because I dont act like them

when I used to let me brother borrow my car, he would take all these parking tickets on my car and never pay for them. He would hid them from me, then one day I discovered about 6 or 8 parking tickets, they were from about four months ago all were on my liscence plate. I went crazy on him then he paid for like 3 of them, the rests I paid for because he was bull**ing me about not having any money. Then more of these stupid tickets kept coming in and he would tell me the same sht. Ok so then I let it go. then after a couple of months, he asked me to get him a cell under my name, like a good sister I did. About 6 months later he stopped paying for it so it go cancelled, bad, bad, bad for my credit. He ended up paying for some of the money to the phone company and I paid for the rest. my little bother used my credit card to order a bunch of nonsense online. When my credit card bill went over limit I was shocked because I had stopped using it for like 8 months. he denied ever using my credit car even though the proof vwas right in front of him. He claimed that all 3 companies were lying and he did not order any thing.

My little sister who’s 22 takes my clothes all the time then leaves them on the floor or misplaced them god knows where and when I asked her for my stuff she’s more mad then me.

All three of them now walk around the house cutting their eyes at me as if I’m the one who did something to them. They ignore me when I`say something or they act all rude towards me. So I ignore them as well. How can my own family be so cruel towards and them act as if they’re the victim. now I never helped any of them. I told my sister to stop borrowing my stuff or I’ll freaking beat the crap out of her. I never let my brohter borrow my car ever again and I let my little bother know that I know he took my credit to buy all these stuff and that I was very disappointed in him. I feel like I’m not related to them sometimes because they’re so money hungry and selfish. These two things that I’m not, and never will be. Am I adopted?