Disappointed about singleton

I cant shake off the disappointment I feel for not conceiving twins. It is like am obsessed. It feels like a punishment. I have dreamt of nothing but having twins and yet here I am with only one. Then I watch many who didn't want twins get them. I prayed so much for twins and at 6 weeks, found out it was one. Am now 9 weeks and still sad. I dont even understand why am so upset. With my first, I was so happy and yet even then, I wanted twins. What can I do to get rid of these negative feelings. I don't want it to affect my baby. I have tried to tell myself maybe sth would have gone wrong with twins and that it is better this way ot maybe I wouldn't have managed the stress but it all still doesn't get me to have pleasure in this pregnancy.