Definitely this.
I've worn hearing aids for a few years now and they took a bit of time to get used to. Like others, I had a GP referral for a hearing test, and was supplied with NHS hearing aids - the difference for 'one-to-one' conversation was immediate and impressive, and they are fine in most everyday circumstances.
............................. BUT
I find noisy environments a major problem, in some cases I feel even more isolated because the background noise (canned music, other nearby conversations, ambient noise) drowns out everything else and makes conversation impossible - lip-reading is not one of my skills so I might have made some serious conversational gaffes. Also the resulting 'in-ear-drone' is very tiring, so I turn the aids off or remove them completely..
I don't wear them when rehearsing or playing live as the sound levels can cause a 'ringing' feedback.
Having said that, I wouldn't be without my hearing aids now - I notice the difference particularly if I remove them when watching television or listening to music at home.
Chris