Do you understand how bitmaps and raster drawing works? Everything is represented as a 2d array of pixels. The circle selection before you paint can be moved/scaled/etc and then when you actually want to draw the circle trace the path with the appropriate thickness and use antialiasing if you need to smooth it.
If you want to make vector drawings, take a look at InkScape. GIMP is the wrong tool for that, so use the right tool for the job if that’s what you want to do.
What’s the problem with making a circle with the select tool and then tracing it or filling it? It’s not hard to make a circle in GIMP…
There’s so much really good BC wine. Kelowna has a bit of a cooler climate compared to the southern parts and has some great whites. Lighter reds like Pinot Noir are great as you go south through Penticton, and Oliver, Osoyoos, and the Similkameen Valley have some fantastic full bodied reds. I really prefer Okanagan wine over most California wine.
Last week I went to taste wine in the Annapolis Valley in Nova Scotia and had some really good wine as well. No real full bodied reds, but some really nice whites - Dry Riesling and Pinot Gris being a few I brought home. Highly recommend checking it out, it’s a bit of a hidden gem.
You could also use the select tool to draw a single circle, then go to the Select menu and click Border which will create the outer and inner selections with the width you specified between them. Much easier than selecting a circle and de-selecting the centre hole.