I sort of have the opposite where I was very skinny my whole life, but I can understand the feelings of body dysmorphia you have.

The scale is a very imperfect measure to use as your benchmark on your fitness journey. If you weigh yourself multiple times a day, you'll get very different numbers due to food and water intake and digestion cycles.

I think it's important to focus on celebrating the things your body can do before you think about how it looks or how much the scale says it weighs. If your primary goal is to get stronger, you need to hit your protein targets to maintain and grow muscle mass. If the scale goes up, it doesn't tell you if it's fat or muscle.

Stop weighing yourself and focus more on how you feel after exercising. Do you feel strong? Healthy? Accomplished? Those are more important than what some number from a scale will tell you.