Embarred to go into a shop?

I'm an adult over the age of 21. I want to buy a toy. I don't want to order it online, because I don't want all of the catalogs they spam you with later. I know a clean, reputable shop in my area that I would like to visit, but I am so scared (haha). I've gone before and just circled the parking lot then drove away. I bitched out yesterday. I want to go today! Does anyone have any words of advice to calm my nerves? How can I look nonchalant? Would it be weird to wear sungles? I want to disguise myself just a little bit, just in case I see anyone I know. Help me muster up the courage to just buy a damn toy!