So don't frame things in terms of how much other people don't want you to do them - more likely than not, they really don't care. Just do what you want to do and don't do what you don't want to do. That's what every other person is doing.
The real world is cold. It takes time, especially out of college/uni, to realize this, but you have to keep on pushing. Best of luck to you.
This isn't a good or bad thing; it's just most people, the vast majority of the time, don't particularly care about what you're up to.
Long term friends do, of course, at least a little, but in perhaps limited doses.
This is both saddening and inspiring (liberating), depending on how you look at it.
Lots of lessons learned there!
That's why I love the "scratch your own itch" philosophy for judging good ideas, helps keep you motivated. And if you personally have a need for what you're building, someone else surely will too. The hardest part is often finding them and conveying it to them, but at least you can be reasonably certain they're out there :)
Another thing to consider is how much acknowledgement you can expect prior to having a tangible product. In my current project I make little updates on Facebook, but since my friends don't have the thing in front of them how excited can they really be about it? But the ones who've tried it, and the ones I'm working with testing it out love it, so there you go!
I guess it comes down to managing your personal expectations to help keep yourself motivated along the way. And who cares about age and life experience, just go for it! That's how you get life experience.
It says basically what Max said, except with more pictures.