Hii be relax throw all material from your mind masturbation is normal physiological function of our body it is one the method to satisfy sexual pleasure in absent of partner both sex and masturbation has same and has same end result to get satisfaction so no need to worry masturbation doesnt lead to any problem. but constant thinking and feeling of guilt of masturbation will effect. It is your anxiety that affect in ejaculation. Premature ejaculation can be treated with both psychologically and drug therapy Psychological means to learn how to stay long,certain methods like Women on top position Condoms,lubricated with benzocaine kegel s exercise will help ful .please read on net and learn how to do it stop and start method of sex is very good results. it is thought diversion method and require time to learn . search on net to do it proper way read more on google masturbating before sex can increase your time proper play and understanding is needed drugs like dapoxetine will help. i prefer it in my patients. Hope you will get best Thank you