I can't decide if it's a boutique or second-hand shop

My friend’s wedding is approaching, and I really want to wear a beautiful dress, but I’m struggling due to budget issues. I’ve checked out boutiques, and the prices are a bit outrageous. There are places that sell second-hand clothes, but honestly, I’m hesitant about that too. On one hand, I’m stressed about whether people will look at me, and on the other hand, I don’t want to spend that much money. What should I do? Do you think buying second-hand would be considered weird?