Why Can't I Say No?

I seriously can't say no to salespeople.  Which, is totally weird because I'm really a mean person...Really.  But, when people try to sell me stuff, while I don't say yes, I have a really hard time saying no...so I just end up making excuses...and then, they always have a rebuttal to my excuse.  I just need to toughen up..or something.  Does anyone else have this problem?

Tonight we went on a bike ride.  I think my bike needs to go in the shop.  My gears are all screwy.  It was a nice bike ride though. 

Well, I don't really have anything else to say.  I'm going to look for a new pair of frames on eyeglasses.com because I think I'm going to get a new pair of glasses.