I have a hard time being intimate?

I dont feel sensual at all on phyciatric drugs, and I have no libido. Im 20 years old and have been on zoloft for 7 years. I worried that this problem can ruin my future relationships. The problem is I cant get off the medication now and I need it to funtion. What do I do? It seems like I can do anything in a relationship except anything intimate. im afraid that A girl will leave me if i cant be intimate all the time.