I need opinions!!!! HELP!!

I need opinions!!!! HELP!!

So I'm having a little trouble here! my gender ultrasound is on the 13th of next month, my boyfriend wants to know the gender when we go in to find out.. i personally don't! Since this is our first, I want to have a gender part or find out in a fun exciting way.. my boyfriend keeps telling me he that he just wants to know. I told him that's fine if he wants to know, he can know, but I feel like he wont be able to keep the secret from me.. I'm trying to figure out how I can change his mind and or keep it from him and get him to realize that this is REALLY important to me.. PLEASE HELP!