Thanks for your query.Based on the facts that you have posted it appears that you may have small capacity Bladderr either from birth (Congenital) or due to Tubercular infection
Please consult qualified Urologist
who will asses you clinically Final diagnosis can be confirmed only after doing following tests.
2)Urodynamic Study of the Bladder,
3) Endoscopic examination of Bladder.(Cystoscopy
Final treatment and outcome will depend upon the nature of Pathology.