Can circumcision stunt penis growth because sometimes when i'm erect it feels like my penises skin is so tight and not natural, and it's only 6 inch?

Eagle: No. Penile length is not affected by circumcision.

Yes ; no: Most circumcisions are performed correctly leaving enough skin to allow for full penile erection. Unfortunately some circumcisers remove too much shaft skin so that penis can not extend as far as it should, like a socking being too short. Happens more often to very chubby babies or kids. 6 inches erect is well within normal range. Check with urologist if skin feels/is too short for a full erectio.

Leave it alone...: How long ago were you circumcised? Note: post-surgical pain, healing, and scar are expected, and take up to 1-2 yrs to reach full scar maturity. Generally speaking, i would leave it alone as long as it's slowly and surely getting better day by day. If in doubt, see the surgeon for more counseling and possible added care as needed. Best wishes...