Don't worry, you're not alone - there are others who feel like they want to be both little and big, and therefore want someone who can be little and big for them. I guess some of them refer to themselves as a switch in this case, but maybe not all.
As for the site, Littlespace Online really isn't just for dating so I recommend reading up and exploring, and trying to make friends before anything else! You can probably even find some people who do switch roles to talk to you about how they handle that. The chat box is always a good place to start, just poke in ^U^
And this is always a good link to check out if you haven't already:
app.php/page/new