There might be a few online stores that currently accepting Bitcoin as payment method. And there were times as well around 2016-2018 era as far as I can remember that many merchants have accepted Bitcoin and it really looks very promising that time.

However, due to the nature of the market, prices keeps fluctuating, very volatile and then then there is also the transaction fees that needs to be considered. Perhaps there are 3rd party that you can used to buy using your Bitcoin, but for now, I doubt that we can used it p2p as payment scheme.