The star was plunged into a deep depression last year (12) after Robin lost his battle with cancer, leaving Barry as the only surviving Gibb brother following the death of Maurice in 2003, and the trio's youngest sibling Andy in 1988.
Barry admits he wasn't close to his bandmate brothers, and wishes they hadn't drifted apart in later years.
He tells Britain's Daily Mail, "You see, it wasn't just the loss of my brothers, it was the fact we didn't really get on. And so I've lost all of my brothers without being friends with them.
"When Maurice passed, Robin and I just didn't feel like the Bee Gees anymore, because the Bee Gees were the three of us. So while Robin went around saying, 'I'll always be a Bee Gee', he didn't really want that: he wanted to be Robin Gibb, solo artist...
"During the last five years, Robin and I could not connect in any way. A similar situation, I can imagine, would probably be Lennon and MCCartney. That same kind of distance occurred between them. The fact that you couldn't get over obstacles or issues in your life."
Gibb also regrets not being there to say goodbye properly before he lost his siblings, adding, "What drove me down was that we didn't get a chance to really say goodbye. The only time I felt we made up was when I kissed Robin on the head the last time I saw him before he died. I didn't get to see Andy before he died, and I never got to Maurice before he died. Mo (Maurice) died in two days, so that was very quick and a great shock to everyone."