I agree with all the above... it may not be you or even him but you simply not being the right sub for the right Dom.

You can learn by reading and asking questions - this is a good place to do that. Thus you can learn things like what activities you may be expected to take part in, safety issues, how to meet a Dom and so on. This will not teach you to be a good sub for a particular Dom but it will teach you to be a good member of the lifestyle.

You can ask to join the tasking society here, where you can learn some more about your own submission through the completion of tasks overseen by a moderator (I'm one of the level one mods so may be asked to read your tasks and comment).

I would also see about getting in touch with your local scene - going to munches etc. Simply meeting people in a non-scene way and dicussing things is a good way to learn.

There is also a female only subs group in this site which I am not allowed to know about so you didn't hear about it from me... PM Delia to ask for more on that...