Low sperm volume

Patient: Hi doctor,Im recently married three months ago,My wife didnt conceive yet, im feeling that it may be problem with me.Because my sperm volume is low.And my ejaculation time is very less. Few mins.Third problem is that desire for sex is very less.I dont know why but i really dont feel anything interested or i dont much desire for sex when i m with her.But when i m alone i feel.Im depressed , can u help me in this regard.Thanks