The actor, who has been in a civil partnership with composer Mark Bradshaw since 2012, explained that while he is open and comfortable about his sexuality now, there was a period of time when he 'hated' himself.
Speaking to the Sunday Times Magazine, he said: ''There was a moment in my early twenties when I did not feel very good about myself. It was to do with my sexuality and not knowing how to be myself and hating myself. I did know [my sexuality], I just couldn't tell anyone.''
While Whishaw didn't divulge any details about the therapy he received, he did admit it 'really helped' him.
He added: "I don't think [sexuality] is the be-all and end-all, and since revealing my sexuality I haven't had any negative effects."
Whishaw also expressed the view that most people are on a scale when it comes to sexuality.
"If we're honest about these things, perhaps most people are on a spectrum," he said.
However, the Spectre star is not so keen on the different terms people use to label themselves, stating: "I hate all these labels. I get mixed up.''
Whishaw will be reprising the voice of Paddington in a new CG-animated series for Nickelodeon, which will follow a younger version of the Peruvian bear on his adventures as he writes to Aunt Lucy from Windsor Gardens.
Meanwhile, we're still waiting on a release date for Paddington 3.
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