I'm also a low hours student. A few nerves are quite natural (at least I hope so!) there is a hell of a lot to take in.
I think at times though what you assume to be nerves is just excitment at being let loose at the controls again.
Although after being bounced around so much on Saturday my biggest fear was throwing up
You may not yet have realised but the average light aircraft can be stopped in a few hundred feet if you really have to, so it is amazing what little space is needed.
I realised this during my last lesson when a dirty big A319 was bearing down on us. A C150 needs very little room!