<human>: I've been with my girlfriend for two and a half years, and over the last six months I've been hinting at thinking about getting engaged at some point over the next year. Things like asking what engagement ring styles she likes and etc. I've known for quite a while that I would like to spend the rest of my life with her and have children with her. All of my questions were met with answers, no hesitation, no hints that she didn't want to talk about it, or wasn't even ready to think about it.

This summer I've been taking classes to finish up my degree to graduate in May, and she has a teaching job lined up for the next year, having just graduated this past May. This summer she has been a counselor at a girl scout camp six hours away, and this has left me with a lot of time to think about where we stand, and where I want the relationship to go. After thinking for about it for the better part of two months, I decided I wanted to make a commitment, to know where this relationship is headed. 

I went to visit her this weekend for the first time in two months, and told her all of this, that I want to marry her and spend the rest of my life with her. She has known since day one I don't get into relationships with just anyone, and that this relationship has a future. But it was met with "we're so young," she kind of became distant and the one that crushed me was, "I just don't know if I want to spend the rest of my life with you." Up until this point all of our discussions on the topic had been mutual and agreed that this is where we were headed, and then she blindsided me saying she wasn't ready to think about it and that the last 2.5 years have just been dating and having fun, when they've been much more than that. 

Am I wrong or crazy for feeling a little shocked by this about face on the topic?

Can you succinctly summarize the text in 1-3 sentences?
<bot>: Girlfriend of 2.5 yrs no longer wants to discuss engagement/marriage any time soon, no longer sure where relationship is headed. Help?