I was checking to make sure that everything is ok on my site. I can add items to cart but cannot checkout. Why is that and how can I fix it?
You can’t buy from yourself.
Everything is working fine for me in the UK, I clicked on Buy it Now and it went to the checkout page with no problems. As mentioned above, it will be greyed out for you as you can't buy your own items.
However, if you want to show up in US only results (of course you do!), then you must add your location or your shop will be excluded.
Add it here by selecting your city/State from the dropdown rather than typing it in yourself for it to work:
https://help.etsy.com/hc/en-gb/articles/360000344268-How-to-Add-Your-Shop-s-Location
All the best