Why are people suspicious of me?

I am a fat old lady in my 50s. Other than ear piercings for one set of earrings I have no body piercings and no tattoos. My hair is the color of black coffee and I have some gray streaks. I don't spike it or wear purple streaks. I am half Hispanic/Latina but was raised in the white anglo community and speak English with a west coast accent. I do not wear a lot of black. T-shirts I wear might have pictures of cats or might be Detroit Tiger T-shirts or maybe Alaska T-shirts because I grew up in Alaska. I made several people suspicious this morning when I went out for a walk. I walked by a place that had several business and walked on the grounds--never went inside of any place. I discovered the manager of the place followed me in and when I found place to sit for a few minutes (I recently aggravated a back injury) he drove near where I was sitting and just sat there staring at me until I got up to leave. Then he followed me as I walked out. As I say I'm a fat old lady and if I stole or vandalized I could be snuffed out in a minute anyone can see that. This isn't the first time something like this has happened. I live in a mobile home and we have a Clubhouse that I help pay for. In the Clubhouse is a dining room, a weight room, a pool room and a sitting room and there are TVs there to watch. I saw some cars parked in front of the Clubhouse this morning and wondered if something were going on. I live alone and have very little family and sometimes I like to go places to be with people. I walked in and the hairdresser saw me and was suspicous. This is the hairdresser that cuts my hair. I asked her if anything were going on and she said she didn't know and shut the hallway door and obviously didn't want me to enter the sitting area. One time I went into the Clubhouse and the manager followed me in so I left. I am a very curious person and as I say I'm half hispanic/latina and am currently living in Utah which has a large hispanic/latina population. Is my curiosity arousing suspicion? Is my "race" causing it? Is it because I do a lot of walking rather than driving? If a sign says "private property" or is obviously off limits I won't go there but why do I arouse suspicion in a public area? As I say I don't have tattoos or body piercings except for holes for one pair of earrings. I don't die my hair usual colors or have my hair spiked. On a day I don't work I might wear T-shirt and jeans so what is it that make people suspicious? At the airport I'm usually searched more than most pengers. I am a teetotaller and I don't smoke or use street drugs.