I would like to echo sivas sentiments , I have a teacher who does not advertise himself and is a precious and from my perspective a living master and I feel blessed to have met him , it was seemingly by accident but who knows ?, I have spent long periods before with great teachers in buddhism , although I doubt they would refer to themselves as living masters , although the main man could be cosidered one , by his followers,( although of course they dont follow him as such ) If you saw him walking down the street you would likely not give him a second look.
But these people might not be the teacher for you , and you cant spend extended time with them today , in the past this was possible. I cant help but sometimes think for you that a Tibetan teacher , llama could be positive for you , a friend of mine has just dissappeared on four year solitary retreat under the guidance of one through samye ling. I think though you would need to spend time with somebody before they might accept you for long a period in a secluded place, away from mundane matters of the world. Tibetans have a fine tradition of debate among other things .
But although the teacher will appear , we of course have to be open to that , and indeed create conditions for that to happen . There are plenty of opportunities for what you are seeking but they dont advertise themselves . I hear of great teachers sharing in India but again I would hesitate to recommend. If I was at the beginning of mine seeking , I think I would go and see Adyashanti and see what happened from that , or there is a tibetan llama that does retreats in Uk and elsewhere that my friends ,go to and revere , I cant rememeber his name but I would see him . Im sure you will find your way . Maybe try some retreats in different traditions and see what resonates for you. metta to you