Airgirl - I've been through exactly the same - and I soloed in September last year after convincing myself I couldn't do it and almost giving up.
My first solo was a breeze - although when my instructor turned to me and said 'right - are you ready to do it on your own' I said 'not sure'. Her response - of course you can - trust me!
Still getting the nerves/self doubt though. This is a lifelong dream for me (from age four wanted to be a pilot - but one poor eye has stopped me being able too until the advent of the NPPL) - and I have been creating my own pressure by wanting to do everything perfectly - which as a student doesn't always happen!
Keep going - it does get easier. Did my solo x-country qual on Sunday - got very nervous before hand - but was better once airbourne. Made a few mistakes - but by the time I got to my second landaway I was getting into my stride.
Test profile with instructor followed by GFT next. At this point I'm really nervous again - don't feel like I know enough to be a pilot! Am sure in a few weeks I'll look back and wonder what I was worrying about!
What has helped hugely is talking to fellow students and pilots - it's amazing and re-assuring to know how many have gone through similar worries.
Enjoy your solo - it really is a magical experience!
Iain