How should I feel now that my baby sister is pregnant?

I just found out my younger sister is pregnant and while I do feel happy for her and can't wait to be an Aunt, I always thought I would be the first one to have a child being the oldest.

I'm also happy that my grandmother will get to see her great grandchild but I was hoping it would have been me first.

It makes me feel sort of inadequate that I have yet to be married with a child at my age and now I think it will never happen after my breakup from my ex.

If I hadn't messed up in our relationship, we would probably be engaged and possibly with a baby on the way.

How do I stop feeling like the inadequate one in my family?
How should I feel now that my baby sister is pregnant?
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