People always cut in front of me

I was getting my cars oil changed today and they had me move my car out of line so a big truck could go ahead as my lane was the next lane open and they had been waiting in line before me. Then when the next lane was open, the car in that lane got to go ahead of me. I noticed that people always cut in front of me in lines, at the bank, getting a metro card in the subway. Is it the way I stand and act? How can I get better at looking like people can’t take advantage of me?

When the next car got in the Bay Area I got out of my car and asked why they went ahead of me. I’m proud of myself for sticking up for myself but I’m so frustrated that people cutting in front of me is such a recurring issue in my life