I have lost my entire sex drive and I'm 19?

it is totally common to have reduced sex drive when on any antidepressant. you are very new to the medication and your body has not likely reached steady concentration of the drug. Wait a month or so. If it continues to be a problem, speak with your doctor. Luckily there are MANY drugs such as Effexor that can be tried to find one that helps with the depression/anxiety and doesnt cause ED. Out of curiosity, have you talked to your doctor about Zoloft?