Dear Sir, this is a common problem. A visit to an Andrologist is recommended in this case. During the visit we can measure the streached penile length and examine you for normalcy. In most cases it is a psychological feeling but some tests can be done to prove that things in your body are fine. This will give you a mental boost. If the mind is healthy and confident I am sure that these sexual issues will not be a concern for you anymore.
Next Steps
Visit an Andrologist for examination and evaluation of blood parameters.
Health Tips
Don't go for unnecessary drugs that may harm your body.