Very concerned to take 1st dose

Just got prescribed for weight loss and received a bit of GLP-1. Im very concerned to start it. Reading horror stories of cancer, paralyzed stomach, puking out both ends. My dad had pancreatic cancer and died at 57, so thats definitely in my mind that pancreatitis is a possible side effect. Be real with me. What are the risks here? I see so many more negative reviews than positive ones. Im 32 years old, 275lbs, 5ft 11in. I wanted to get it to help with diet but I’m beginning to feel it was a mistake and I should just suck it up and be hungry. I don’t want to ruin my life.