Gender reveal rant / advice wanted

Shannon
Hey ladies! I'm due with my first in August and my fiancé and I are super excited! We're planning on finding out the gender at our 20 week ultrasound (mid March). Obviously I want to share this info with my friends and family because it's so exciting and I love keeping them in the loop. The only issue is that my dad and stepmom are giving me grief because "they want to be surprised". I can understand how they feel as they didn't find out with my brother and I get it, not everyone wants to know, but I'm very annoyed and upset by this. Personally I think it's selfish of them because it's not their pregnancy and if they make me not tell them they are literally the only people I would keep it from.  I just feel like it automatically puts me in a position where I have to limit A LOT of sharing and keeping them involved. Has anyone else had this issue and how did you deal? Am I completely crazy?!