Baby Shower Blues 🙁

Petite
Im 23 years old and this is my first baby. I am excited about my whole pregnancy except the baby shower part. I grew up in foster care so I don't really have any family. I talk to my dad sometimes and my siblings are 15 & 16.  I have 4 friends to be exact. 
  I was thinking about not having a baby shower but this is my boyfriends first child as well at the age of 29. His grandmother and I have become very close. She's so excited about the baby. 
  I am afraid my baby shower will be dull with very little people. The majority of the people there will be his family members. None of my family will be there at all. I don't want to sound selfish because this is a new experience for both of us. Family gatherings and holidays always make me sad because I have no one.
   Am I being too concerned or being self absorbed? I haven't told my boyfriend about this because I don't want to ruin the moment. What should I do?