Slow Metabolism, Endomorph
Most people who claim to have slow or fast metabolism actually do not have that.
Metabolism can be boosted by boosting your NEAT (Non Exercise Activity Thermogenesis) or adding more muscles or simply moving more!
So how do you know if you truly have a slow metabolism? First of all most people's metabolism when adjusted for muscle, body size, activity level is pretty close the difference might be 100-300 in case of "fast" and "slow" but not enough to have someone fail in weight loss.
The people who really have slow sluggish metabolism tend of have chronic illness.

Unless you've measured your Maintenance Calories (TDEE) and tracked every calorie you eat, claiming to have slow or fast metabolism is pointless.
Maintenance Calorie Tracking Guide
If you eat more than Maintenance, you gain weight
if you eat less than Maintenance, you lose weight.
You'll see weight gain within 2-5 weeks if you use this method!