From that audiogram you have a steeply sloping loss, with little to no loss in low frequencies but a severe loss in very high frequencies, so whether or not you feel you need your HAs is probably related to the type of input you are receiving. I would bet you can converse easily with men without any hearing aid, indeed you may find them easier to understand without since your ear is not bunged up with a mould/dome and you don’t have any microphone and speaker distortion happening to it. But I’d also bet that if you sat down to an episode of the Simpsons you’d be a bit mystified.
But then again sometimes what you can hear doesn’t seem to match up with how it comes out on pure tone testing. I can’t understand men even though by frequencies they should be in my best range, they seem to talk entirely without consonants, and I can’t understand little children either.
In your case it makes no sense to average your loss, but this “Ski-slope” pattern is one of the most common so most will know what you mean if you describe it like that. Hopefully that’s not a nasty shock to you, though, that you have quite a big loss in your highest frequencies.