How To Remove Foreskin?

i am mukesh 22 yrs old boy i want to ask about how to break my penis seal? i had done sex about 5 times wid nd widout precaution nd also i do hand practice twice a month..when i tried to strech my skin back it pains a lot i cannot handle that much pain. due to this i think my penis is small as well as my body posture is weak...plz help me provide ur suggestion...