I masturbate 4-5 times a weak ? is it in excess ? will it effect my sperm count ?

No: The sperm count will be fine and frequency is ok for a young man.

No and Yes: Frequency of masturbation is no issue, except if you are with a woman and can't "seal the deal" with her, she may wonder if something is going on. She may ask if something is wrong with her - then, you may have to time your masturbation in order to have good sex with your partner. The other issue is sperm count: if you want to have a baby, don't masturbate during her fertile week to keep count up.