Never can spend time with myself

Hey, I (F 25) am very overweight and trying to change my life and lifestyle but I am so soo embarassed to go out by myself for a walk or anything like that. I feel like everyone is watching me and thinking "she prolly has no friends, the fat girl" 😬😬 and it bothers me so much, Instart shakung literally!!! And always trying to do smth on my phone when out. Also I am divorced which is kinda a big thing in my culture, which makes it worse.. but anyways, the neighbors girls are so pretty and I hate them bc of their personalities and avoid being seen by them. How can I overcome this? I am so sick and tired od this lifestyle I HATE it.. Uni is also about to start and I already see myself crying because no jacket and no hoodie suits me and I just go there with the same outfit everyday. Has anyone had the same issue. 😪