I Don't Know Why I Feel Like This...

My best friend is engaged... but I don't know why I'm not excited for her.

Is something wrong with me?

I mean, I was excited for her when she started dating her boyfriend, and I'll admit that I was sorta excited when she found out that she was pregnant, but I just don't know why I feel like this. It might be because it finally sinking in that my best friend isn't always going to be around, but her relationship with her boyfriend is completely different than what I'm used to.

She's known him for as long as she's dated him... which is about about three months. They moved in together around one month into the relationship, and she's already about a month pregnant, and now she's engaged. I feel like it's moving all to fast, but who am I to defy her love? I don't know how strong the connection is, or how deep her feelings run for this guy, who I met a few days after she did.

But the thing that gets me is, she's younger than me... almost by a year.

I'm nineteen, and she just turned eighteen.

Now, after reading all of this, is it completely normal for me to be feeling like this?