I agree, the people around you can have such an influence on whether or not you succeed in something or not, by their attitude to seeing you doing it. If you've got support and encouragement around you it counts for such a lot towards your motivation. Sometimes you just meet someone who makes a chance remark or observation that sets things going for you, just because of a throwaway encouraging remark that nobody else has made to you.
Quick example - I had a new member of staff to train at one of the theatres I work in, about two years ago, who is now a good friend. She's in her early fifties, two grown up kids, happily married and had just moved to the city from somewhere rural, and her ruling passion in life apart from her family is opera. She'd never indulged it while the kids were at home though, and neither her husband nor any of her existing friends were into opera. She'd never been to an opera on her own though - and was genuinely shocked when I asked her why not. Nobody had ever said to her 'you're allowed to have interests your nearest and dearest don't share'. It was actually a completely new line of thought for her. So she went to the opera on her own, after I'd spent some time encouraging her that she could if she wanted to, and loved it. Now she travels all over, both in this country and abroad, to see as much and as good opera as she can. She made a deal with her husband that, when she's off to the opera, if he wants to go cultivate some new interest - or just do things he likes that he knows she's not interested in - she's very happy for him to do so and will support him. Their marriage is stronger than ever because she finally started doing things she really wanted to and she's happier now than she's ever been.