Denealx,
How are you measuring your length and girth, in particular your girth? You should measure your length “bone pressed,” i.e. along the top side of the shaft, with the ruler pressed all the way into your “fat pad” against your pubic bone. This is the best way to gage your future gains.
To measure girth, measure the circumference of your fully erect penis, using a cloth tape measure or a piece of string or whatever. Measure several places along your shaft, including the base. You want to know where you are the thinnest and where you are the thickest.
Please do this and report back with the new measurements, if they are different.
Yes, you can gain. In fact, it seems to be the case that smaller men find it easier to gain—perhaps because a smaller dick is simply easier to stretch, etc. You’ll definitely gain if you work at this consistently and intelligently!
Welcome to the forum.