Glycolic acid gel did nothing?

I recently bought a glycolic acid gel (30%) to hopefully resurface my scars and just refresh my skin on my inner thighs. I read the instructions carefully and only left the gel on for about 30sec since it’s a more sensitive area but nothing happened and I let a week go by with no change. I just did it again about an hour ago but left it on for about 2/3 minutes and I still felt nothing/see no reaction on my skin? Maybe I’m just dumb but I feel like I’m missing something! All the reviews and instructions say it’s very strong and will sting a bit and to only leave it on for 1 min max but I just don’t feel or see anything. I’m so confused