Few questions

Ok my first questions is when im erect my balls like tighten they have always tighten but now when i beat it they sometimes hang is that a indicator of low sperm count

Second questions when i ejaculate i hold my foreskin like shut so i dont make a mess can that cause problems

Third question is it normal if i only have pubic hair even though im 18 its like a bush that hasn't spread to my legs or nothing

Sorry for typing a whole novel here