it cannot be taken as premature ejaculation
Being you r doing 4-5 times a day every time you are in hurrry to finish it as early as possible to avoid the notice from others.
as a result body is adjusted with your intrest .
try to reduce the number from4-5 per day to weekly 4-5 very slowly
always u practise sits bath method befor taking bath for about 5-10 minute,by dipping whole pennise in a mug of water and slow massage
over dorsum side /upper side
try for 2 months this along with confidence
its not disorder ur mental preparation only no need to worry get back me after 2 -3 months
have a nice time