shrinking tesitcles with a slight discomfert

i am also 17 and i've noticed my balls shrinking
my friend told me mountain dew made them shrink buti researched that and it's a load of c**p...i hope
i'm a senior in high school and i was thinking it may be stress but i'm not sure

i looked at the other topics similar to this one, but however, i can still get erections and my penis doesnt seem any smaller, or at least not noticeably smaller
sometimes it feels like my balls are tingling and it's slightly discomfortable, or it feels like the sensation of when your sack gets cold and decreases size to keep warm. Sorry if that isnt much help as to describing what it feels like

furthermore, it seems that i may have added a few pounds and i was wondering if this may be a hormonal problem

i'm a healthy masturbator and everything seems to function properly
i just wish i knew how to return my testicles back to their old larger size
also i'm a virgin so i was wondering if that might affect anything

i'm also quite worried

I noticed that my balls are getting smaller. Am I going to lose them?