Well, firstly, perhaps you should try taking a looking at your friend and their motives in a more positive light. Fair enough, they may have gotten it wrong but they still went to all that trouble to get you leaflets and whatever, right? That's just showing their concern as a friend. It means he cares about you. If you want, now, all you have to do is have a quiet word with him and explain that you don't have social phobia, but you do appreciate the trouble he went to, y'know? It was a pretty nice thing for him to do, even if he was way off the mark. I mean, if you say you don't have social phobia then fair enough. It does sound like you want to regain a little of your social life though. It could be that your depression is causing you to feel unsociable, perhaps? Maybe if you do want to start socializing just a tad bit more you could start small - with your best friend. You said it's difficult to make friends and I completely agree with you! That's why starting off with a friend you already have might help some. Even if you get out your house and see him just once a week. It'll do more than help your social life, really. It'll get you out and about. Sometimes just sitting at home can make depression a wee bit worse - doing the same thing, day in day out. However, I don't know what you do daily so I can't really comment. I understand you have a job now? That's good - that'll get you doing something different every day and will have you interacting with people more often. It'll probably help your confidence, too.
I don't know. It really all depends on whether or not you think you have a problem, and if you do, what is it? What do you want to do about it?
Even if I have something like social phobia I wouldn't and couldn't see anyone about it. That's because they don't really care about me but want to make money off mine and others problems. 
A little aside from your original point, I'd just like to suggest that you don't cut off all sources of help immediately. I'm not suggesting you go see someone about what you're feeling now - you don't want to and that's ok - but for the future. Don't tarnish them all by saying they don't care and simply want to make money. Most professionals have gone into that profession because there's some kind of compassion in then; they want to do something to help and free people from their unhappiness or whatever other problems they face. Yeah they get pad shitloads for it, but they also take that time to listen. They don't solve problems, but they listen and advise and sometimes it's fantastic to have someone outwith the situation listening to us.
Whatever, though. I understand where you're coming from and, again, I'm not suggesting you go to a professional or anything now. But if in the future you should ever be in need of help, well, once more, don't shut off all your sources of help.
Anyway, as I said, if you want to elaborate on some thing, go right ahead. I'd be glad to read it and try to help.
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shelves in the closet? happy thought indeed!