No you're not crazy, but maybe you're not completely ready yet? Maybe you like the idea of having a baby more than the reality of it? In other words, maybe you really really want to want one now, but deep down, unconsciously, you're not quite there yet? Or maybe you are ready but just scared of the unknown...
I mean, I might be completely wrong, but what you say reminds me of me when I was 22.
I was convinced I wanted a baby... When I thought about it, it filled me with joy and excitement. My oh and I decided to start TTC. As soon as it came to actually trying, I was filled with dread and couldn't go through with it. Saying I was confused and utterly gutted is an understatement. There's nothing more disconcerting than not understanding your own feelings... Like you, I even had bought some baby clothes and loved going to shops like mothercare etc... planning for when it would happen! Anyway, After the failed attempt, when I thought about having children, one day I could be super excited at the idea, and the next, the same thoughts would fill me with anxiety. When I talked to my mum about it, she said it most likely meant I wasn't quite ready yet... and when I was, I would know. For a long time, I refused to believe that... I so wanted to be ready then!
However, a few years later, the feelings completely changed. No more did I ever have negative feelings towards it, nor was I worried about the changes ahead. Then I had a fair idea I was ready. However, because of my previous experience, I was still a bit cautious I might back out at the last minute, but I didn't! I was so excited!!
But it's only when I got the negative pregnancy test staring back at me, that I realised just how much I wanted a baby, and how ready I was! Sadly, now I'm emotionally ready, I'm still waiting for that positive! Argh, TTC 17 months already...
So, my advice to you, being as you're in your first TWW, don't worry about how you feel right now, in all probability you might not have caught yet. Wait till you either take a pregnancy test or your periods arrive, and see how you feel, as this will be your answer as to whether you're truly ready or not.
And btw, I'm sure you'd make a great mum. The fact you're concerned about whether you could be, in my opinion shows you would be. The doubt probably just comes from the unknown, and the fact you haven't met your baby yet! In other words, you haven't yet built a relationship with him/her.