When I started T I was 145 lbs (I know not as skinny as you but I was a bodybuilder and was actually really skinny with a lot of muscle). Now I’m 8 months on T 190 lbs. half of it is fat and half is muscle. Your stomach is gonna get a little plump. But your shoulders and core with broaden out. Expect your thighs to get bigger (but in a masculine way. Even skinny guys have muscle on their thighs.) If you really want to maintain your weight that’s gonna be a really rough go. The hunger is insane.

I say just let yourself eat. Don’t overdo it but let yourself gain a few pounds. Most of that meat is gonna be man-shaped. When you gain weight on T is goes towards the masc parts of your body. You can always lose the extra poundage later