Hi sivam ;
welcome to HealthcareMagic
The white stuff can be smegma which happens due to collection of urine drops as well as semen and if there is pain ;itching or redness
then it can be inflammation(balanitis
).Non-retracting skin can be due to phimosis
.It will be better to get physically examined by a surgeon to find out the problem.If it is phimosis then you may require circumcision
which the surgeon will advise after examination and if you want he will do it.