Safe protein and vitamins supplement.

Dear Doctor, I would like to seek your advice regarding  safe protein supplement and diet for me, i am having history of kidney stones.I feeling weak, has experienced weight loss, and considering joining the gym.Also suspects low testosterone and facing hair breakage. I am  willing to take NAK Pro Protein and would like to know if it is safe for me, considering mine medical history. Could you please recommend safe protein supplements, any necessary vitamins, and a suitable daily diet for me. One more query sir I am feeling shame but I am having damn bad sexual health as my sperm get ejaculate in just 10-20 second and I am feeling too bad and depressed  due to this and this is because in my childhood I am not aware about this all and in my 2nd class I do fiction for pleasure and after puberty when sperm get out I excessively masturbate which makes my penis bent and timing was almost end I am feared of going with a girl on bed I am virgin till now I don't know what to do plz suggest