He said nothing he does will compare to the success of their band, Oasis.
The prolific High Flying Birds songwriter said he never thinks about his past in his globally successful previous band.
He said trying to repeat the impact of "the best band of our era by a mile" would be pointless, having "nailed it" the first time, and is happier with the freedom of writing solo songs.
Gallagher, 52, conceded that his obituaries will remember him as part of the Manchester band, and he would have nothing without his brother despite their famous feuding.
Speaking to the PA news agency, he said: "We broke up because of a perfect storm of little things.
"Once it was done it was done. It was me and the other fella.
"I wouldn't have gotten anywhere without him, he wouldn't have got anywhere without me."
He joked: "Now we're doing our separate things - well he's doing my thing, and I'm doing my thing too."
Gallagher spoke at the BMI London Awards 2019, a gathering of major figures in the music industry, where he was honoured with an award for his decades of songwriting.
The star, who was joined by wife Sara and daughter Anais, believes his creative output is now solely for himself, and feels freer in his writing.
However the singer, guitarist and lyricist knows he cannot escape Oasis, and is proud of his past work.
"There's no point going round the houses forever trying to rewrite Champagne Supernova," Gallagher said.
"I don't ever think about it, I genuinely don't think about it.
"I know we live in age of nostalgia and everyone wants us to get back together and all that, but I genuinely don't think about it.
"I play as much as I can be arsed playing, but it's not something I think about at all.
"When I eventually, at the age of 104... I'm going to cryogenically freeze this hairdo and that will probably stay out in the universe forever, being my representative - the news reels will say 'ex-Oasis'.
"I'm cool with that. I'm not bothered about my solo career being compared to that, nothing is going to compare to that. We were the best band of our era by a f****** mile.
"You only read about half of what we got up to."
Gallagher said he is resisting the call from fans to reform, but joked of former bandmate Paul "Bonehead" Arthurs: "We should get back together and do a benefit gig for his f****** nose hair."
"I love what I do, I love being me, I've gone through different eras of songwriting," he said.
"I'm at a period now where I'm writing songs I think... 'a lot of people are going to hate this'.
"I haven't got any hobbies. I can't drive, I gave up smoking, I don't do drugs, I can't swim. I don't really like going on holiday, I like football. What else am I going to do?"
The musician was given the BMI London President's Award for his achievements in a ceremony at the Savoy Hotel in London.