As others have said: there are definitely situations where individuals have benefited very much from group therapy. But that does not mean that all people are suited for group T, and even those who are, aren't necessarily helped by every group.

If you don't see what the benefit would be for you, there is no reason why you should try it. I know that I would not be helped at all by being in a group therapy situation (I would feel doubly alone and twice as weird as I normally do, and I can't imagine what I would find to talk about), and I have no intention of trying - it has never been suggested to me either.