Please Urgent Help Needed.

I relapsed on 21 st feb complete 21 day streak of flatline. I only watched porn not even touched my penis. Why can't I get that much hard by watching porn. I mean i watch porn everyday, I only get get soft erections. And as soon as the porn ends my libido get back to zero. Please help. Please explain. I can't use my dick even with porn. In morning I get erections but no libido from 1 st feb. I didn't masturbated but watched porn. What's happening. I want my 2019 sexual hunger back. Please help. I'm 18 Tommorow is birthday. I please want answer as a gift. I am physically perfect. Testosterone. No infection everything perfect in my report. What to do now. Doctor said masturbate or i should wait for my libido to be back. I get some some erections with porn, but no libido no sex desire as soon as the porn shuts.
Thanks.
I beg for your help. I'm so scared.