how to deal with a little gender disappointment

This is my first pregnancy I long for a girl had all my family members telling me they think it's a girl. Did my ultrasound and the tech said she thinks it's a boy... because she said she thinks I went to do a 3D scan to get a definite answer and they said boy. My husband doesn't care what the gender is but he said would be nice to have a boy however he decides to not find out until birth. So I'm the only one to know it's a boy I'm a litttle shatter but I obviously love my baby still regardless and happy he is healthy and active already. I m just a little depress as I don't know if this is normal to be disappointed 😔 and I feel guilty for feeling this way and I have no one to share this with as my husband doesn't care what the gender is.