I’m jealous of those that still have their parents! It isn’t fair!

I lost both my parents before the age of 20. My mom when I just turned 18 and my dad when I just turned 19. A year apart. Now I am 21. Just turned 21 three months ago. When I see people my age or even older than me still have their parents and happy, I get very jealous and furious. I Hate Mother’s and Father’s Day. They’re just reminders that I don’t have parents anymore and I’m an orphan. Relatives have giving me a hard time and blamed me for both my parents death.
My older siblings (half siblings) had dad longer than I did. My sister was 35 and my brother was a month away of turning 39.
They still have their beautiful mother who is I think turning 68. My sister just turned 37 and my brother will be 41 in March.
It isn’t fair! I was just a teen and my peers still have their parents! I want mine back!! 😭😭😭💔💔💔