Hi I hope someone can help me I'm a little worried.
I'm an 18 year old young man who has had sex with about 5-6 woman. I'm circemsized and have been since birth.

I masterbate sometimes but my problem is I woke up errected and had a feel like most men and at the end of my my penis, at the top near he end is a hard bump, and its slightly long only about 3-4 CM , I'm a little worried but a very shy lad when it comes to showing my penis to a docter or what not. Any information what this could be? :( Bit scared.

It is best to go to the doctor.

Joe is right here, you need to be seen by a doctor to make sure that it is not a STD.

I understand your shyness, but make an appointment with a male doctor, and remember he has a penis too, so it won't be something that he does not see every day.