What to do when you feel like you don't belong?

Today I received a text message on my phone saying I could get 20% discount on my purchases from New Look if I gave them a particular code at the checkout.  So I took myself and my bubba off into town, him in his pushchair and headed to New Look to see if I could scout out a few bargains. I haven't actually shopped in New Look for probably a few years, but didn't think I was so past it that it wasn't a shop for me.  Top Shop maybe, but not New Look.  How wrong was I?  Not only was it patently clear that the staff rarely came across a shopper with a baby in tow (lots of faffing in the changing rooms), but the clothes were most certainly targeted at a younger age group that my own!  Seriously, unless you enjoy wearing leggings and a denim jacket with the sleeves cut off, there was nothing in that shop for you.

I meandered around town for about half an hour after this and left feeling a strong sense that I didn't belong.  Talking on the phone to my sister later I said that it wasn't that I felt too old but just that I wasn't part of that world any more.  I had very little desire to buy anything, in fact the only thing I saw that I was even remotely interested in buying I decided I could make myself.

Is it just me or do you sometimes feel like you aren't part of this world?
Sometimes I think I just want to pack it all in, sell the house and buy a shack or mobile home or something with a little bit of land, grow my own veg, have a goat and not worry about the rest of the world, just my own little patch with my husband and baby where I don't have to constantly compare my body to those of the over stuffed teenagers tat are forced in front of out faces every time we open a magazine or see a billboard, where I don't have to think about the latest trends in fashion, or the newest age defying face cream.

Do you ever feel like you want to reject the modern day world?  How do you satisfy this longing when you really can't escape the life you have to live?