If you don't want to go to a boutique... the don't go.
I didn't want too, and I had my arm twisted by work colleagues, saying I was missing out blah blah, so we went. And I hated every damn moment, I felt fat, frumpy and stupid.
And I bought my dress online, altered it myself and looked amazing and I was beyond happy.
Do what makes you happy. It's your wedding. Don't allow people to tell you to do shit "because other people do".