Hello, I am 20 years old. For around a year I am facing with a problem. My penis feels less sensitive on the glans and is thinner than used to be. I lost my morning erections, which were frequent before. I can achieve erection most of the times, but its weak and I feel like my glans is not really erected + the erection is weak and feels different. I ve had some blood tests, hormone tests and thyroid gland tests and they all were good I only had raised level of hemoglobin. Does any one know, what is happening to me? My penis is slightly red on glans and started around the same time...no pain or anything. Even when I urinate my penis feels as if half of it was asleep....similar to when you lay on your hand for long time.....what should I do? happened just randomly.........did not see problems before this just from day to day
Maybe it is just overthinking and anxiety. Relax a bit, eat a healthy diet, walk/jog daily and try to learn Pelvic Floor exercises (Kegel exercises).
And if you are on any medicine, consult your doctor if that medicine is causing trouble.
I am improving my lifestyle right now. Although I am stressing about it a lot I don’t think it is just overthinking. I know my penis and know how it was before 
If you feel there is some underlying cause, do consult a urologist for treatment or reassurance.
It would be best if you detailed all the symptoms and circumstances you have with a Urologist