No that is perfectly normal. The average penis size for an adult is 5-6 inches erect. You could still grow a little more before you reach 20.
Absolutely not. In fact, it happens all the time, often when the patient is worried about getting an erection in the doctor's office. You are only gay if you are sexually attracted to members of the same gender.
That is a young age to have erectile disfunction - but it can happen. He should have his prostate gland examined by a doctor to see if it is enlarged. You might also want to have an honest discussion with him about what his sexual turn-ons are. One question that would be asked by a doctor is whether he has trouble getting an erection while masturbating, or only while having sex. Performance anxiety can occur at any age, so that may be playing a part as well.
only if your doctor approves!
Mixing any drugs should only be done on the advice of your doctor
Only your family doctor should answer that. An olympic runner and a pro wrestler of the same height certainly will not weigh the same. Neither in general are out of shape, yet they are both considered athletes......Tricky question!!
Erection.
There are only a few cases in which an individual should see a doctor for their back pain. In this situation, one should see a doctor because of the fact that one acquired it from falling.
Only if your doctor has prescribed it.
I suggest you break up with your girlfriend and leave both of them alone. Find someone who has an ugly sister. Or better yet, and only child.
Only if your doctor prescribes it.
That what has been prescribed by your doctor only.
You should only have bones. If you have muscles, see a doctor