Ok, I am 20. I lost my virginity a month ago (haven't had sex since, yet), it was great, I had an orgasm and ejaculated

. Prior to that day, I had no problems with getting an erection while masturbating but couldn't ejaculate no matter how hard I tried. Despite (or maybe because of) that, I frequently had ejaculated while asleep. So, understandably, I was thrilled when I successfully lost my virginity and ejaculated for the first time. However, I am sad to say that I can't ejaculate again. Its been 30 odd days since, and I tried to masturbate every day, but still couldn't ejaculate, yet I did have a couple of wet dreams.
What's wrong with me? Do I have to go and get laid again to ejaculate? This frustrates me, I should be able to derive enjoyment from masturbation. I want to be able to ejaculate when I want, not while I am asleep. Please help