So I'm deeply scared I have cancer again? Please need help and some peace of mind, need info on what could this be please ok begging?

When I feel both sides of my hips close to my abdomen the left side feel more puffier like there's more meat like something there but there's not, where the other side feels like nothing is there, I had a wilms tumor many years ago on my left side of stomach so maybe that's why everything feels different? I'm scared it's a tumor, I haven't had my period in a month do to stress but I've been feeling this for months, I posted a pic for you guys to kinda understand where I feel this, I'm 17 and I'm so scared I have cancer again, my mom feels it's just do to my surgery and having everything shift when I was little, I never went to the doctors because my sister has been very ill

It's like I feel both sides under my stomach, the left side just feels more out and I can feel more like fat or whatever, and small little lumps, I'm also a little over weight and have a stomach