Antony has produced career best form at Betis since his January arrival on-loan from United.
Discussing his time at Old Trafford, the Brazil international told ESPN Brasil: "I think that, apart from my football life, my personal life got in the way a lot, because of the things I went through, the moments I lived there.
"Like it or not, it's affected me a lot. So, of course, I know the potential I have. It's not for nothing that I went to a World Cup, it's not for nothing that I was sold to United for a lot of money, and I know my worth.
"People look at the moment, but they don't look at the bigger picture, what happens to bring things about.
"So, as I said, my feeling at United was that I had good moments, bad moments too, but of course I could have done more, I could have done better."