Are you able to have penetrative sex? if you erection is good and sex is satisfactory, everything should be fine. Although theoretically, both your symtoms are possible with reduced Testosterone level
but it will affect erection, not the size of penis.
Most men in the world are overly worried about their penis size and testis. but most commonly , it is based on their false perception. If you keep on worrying, things are going to be worse and worse. so if you can have sex, why worry!!
Dr Saatiish Jhuntrraa