((((((((((Lacer Vita))))))))))) I'm really sorry you're feeling so anxious. I think you were very brave to talk honestly to your friends about your depression. But I'm sorry that one of your friends insists that it's possible for everyone to positive-think their way out of depression. Unfortunately some people who have never suffered from serious depression do believe that.
But I think a true friend will try and see it from another point of view, even if they don't necessarily understand it. And certainly your close friends should support your efforts to get better.
It's great you're getting professional help. Please don't let the reaction of this one friend make you doubt how important that is. You need to do what is right for you. And if one of your friends can't accept that, you still need to do what's right for you. I really hope your other friend is being supportive. And I hope we can offer you some support too ((((((((Lacer Vita)))))))))))

You are doing the right thing by getting professional help!!
Good luck with your treatment and let us know how you're doing!