What Causes Tightness In Scrotum And Testicles?

hello i have a question, im 18 years old, almost 19, i am wondering if i might have the symptoms of delayed puberty or anything related to that category. about 90 percent of the time my scrotum and testicles are tight against the body and seem to be the same size of when i was younger. rarely are they relaxed. my penis size is also a question i would like to ask. fully erect i say its about 5 and a half, yet when relaxed it can be an inch at sometimes maybe little more. when my scrotum is elevated which is most of the time this is when the shrinkage is most noticable. i am a confident man yet this does worry me to a point where i need to ask a question. im 5'8 142 pounds, on vyvanse 50 mg and introducing myself to cylase something like that its a depressement med. i dont have much facial hair, i do have some on my chin, i do have pubic hair, but all in all can u help me out with some suggestions or diagnosis?