I've been worried about my own low boredom threshold for quite a while now. I do suffer from depression, which probably doesn't help. What I find most troubling though, is being with other people. Whether family, friends or strangers, there are very few times that I don't feel bored by the chit-chat that the others seem to find interesting and worthy of comment. This leads to me isolating myself, sometimes I make an excuse to leave, then go and sit in a bar with a book to read.
In fact I would say that's one of the things in life I find most enjoyable. Sometimes I arrive at a date early just to sit and read, and I find myself getting quite annoyed when the other person arrives and "interrupts" my reading.
Even with important family affairs, I find I have to force myself to be interested, trying hard to find something relevant to say.
Like others here, I've also started numerous different hobbies - playing the guitar, writing a book, photography etc - starting off well and full of enthusiasm, before dropping it all, selling the guitar, camera, whatever.
I would be glad to hear from others who have a similar problem.
Thanks for reading this.