Regular mastrubation is a healthy activity and there is no frequency at which you can starting loosing the juice. There is no correlation between frequency of mastrubation and sperm count. 'Early discharge' as you call it, is otherwise known as "Premature ejaculation" It is primarily link to anxiety and performance pressure. Try and delay ejaculation during mastrubation, gradually. Practice make a man perfect. I suggest you read on star Squeeze technique and Stop Start method, besides considering delay spray, which are easily available in local pharmacy. Life style changes, reducing consumption of alcohol, relaxation, exercise, yoga
, will all enhance physical wellbeing and positively contribute to psychological wellness and confidence. Equally, low dose anti-anxiety medication from SSRI group of meds may help.
You might benefit from seeking one 2one consultation to explore other reasons and psychological problems. Best wishes."Premature ejaculation