I Am A Boy Of Age 25 I Have A

i am a boy of age 25 i have a bad habit of mastrubatibg which sometimes increase to rwo times a day .
i am very tens about it.and also sperm is like water
my body structure is thin , and my apetite is very less ,
i also want a good body structure but am unable to take good diet because of my bad apetite .
what can i do to increase my diet ?
another problem is that my sex tym is very short my semen is released early what can i do to couter these problems??
please help me :-(