Sometimes I can go into a quilt store and find that I'm just not in the mood to like anything I see. (Too bad that doesn't happen more often.) If you aren't in the mood to buy, don't feel bad about leaving.
When I first started quilting, picking out fabrics for a quilt was my least favorite activity. I had no confidence, and practically no stash. Now that I've had more practice (and a larger stash), it's one of my favorite parts of quilting.