You can choose to keep your wedding a total secret, which can actually make it exciting and fun, or you can tell a selected few close friends/family (but be warned not everyone can keep a secret!) Or you can just tell everyone you are going to get married in an elopement ceremony!
It’s your choice and you don’t need to feel pressure from anyone.
The main thing is you are sure you are doing the right thing for you, then you can relax into your special day, knowing it will be exactly the way you want it to be, without having to factor in a zillion outside influences!
You can always arrange a party when you return, to celebrate with family and friends, which can appease any objections, and where you can show your wedding day photos/video, wear your wedding outfits again and have a cake to cut.