Welcome to HCM.
Try gentle retraction of the foreskin at bath with soap and water. If still not retractile, it is wise to consult.
I am sorry, i cant understand your last statement.
During the intercourse, the space available in the vagina is limited for the penis to have the jerky movement associated with ejaculation and hence you have the feel, whereas during masturbation
the penis has enough space to have the jerky movement at ejaculation.
Hope this answers your query.