Body Goals Happening But I Don’t See It??

Basically b4 each of my welding classes I am in the treadmill in PC class. I’m on there for at least 25 mins twice a week. Recently one of my classmates complimented me saying that I’m slimming down. Great!

But I ain’t seeing shit.

Like I’m pretty sure I have t lost anything bc I still look the exact same. I’m literally so confused, but I’m glad that my stamina is keeping up. I wanna get skinny and all but I just don’t see the physical progress.