I have a somewhat pulling in my groin area like a strained, or sprained muscle. i cannot get an erection. what is going on?

Hernia?: Have your doctor check you for a groin hernia. Pressure from hernia can interfere penile blood flow but probably not enough to prevent erection. So pain is probably preventing erection.

Groin Pain: A hernia occurs when the tough connective tissue that completely covers our bodies (under the fatty layer) develops a weakness or true hole and the stuff inside bulges out. If you are having pain, it means that the area had some injury. If there is a bulging and it does not reduce easily, then you need to see your doctor. Otherwise, Motrin or advil (ibuprofen) should help reduce the pain.