Hello. As I understand correctly you are having frequency since you were 11 yrs old?
Can you describe in details your problem more?
How is your flow of urine?any burning sensation? Any leakage?
As of now there are no medications to increase capacity of urinary bladder (urinary gland which you mentioned) , so I advise you to not take those medications
Get the following test done and review
Next Steps
Urine r/m and culture
Usg kub with pvr
Uroflowmetry
Bladder diary ( record the time and amount of liquids you drink and urine you pass