Yesterday....
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Yesterday was my birthday!
I've become 19 years old.
I was celebrated by many people I know, especially my girlfriend.
She gave me new shoes as a birthday present.
I was so happy.
I've become 19 years old.
I was celebrated by many people I know, especially my girlfriend.
She gave me new shoes as a birthday present.
I was so happy.

I turned 19 years old.
I was celebrated by many of my friends, especially by my girlfriend.
by my girlfriend の by が、必要なのかどうかは、ちょっと自信がないのですが。友人にも一度聞いてみます。
It was celebrated by many people I know, especially my girlfriend.
Vermilion's correction is fine, but the 'by' by the 'my' is not needed (it's implied). It's fine either way, though.
I was celebrated with many people I know, especially my girlfriend.