I assume this
this is the thread you're referring to?
I can't see anything wrong with it, but the roleplay section is quite a busy board, and your thread has already dropped onto the second page. Once it's off the first page, it's unlikely to be seen again, and whilst I don't know the deal bumping such threads, I know I've seen it done.
That said, if no-one is replying to your thread... go and reply to other people's threads instead! You don't have to sit back and wait for a PM, or an invite to join a group here, so if you see someone else that's looking to do a roleplay that you like the sound of, then just send them a message and get chatting. If you're really keen to get roleplaying, you could try the "Jump In" section, too.
There is a certain element of "popularity", too. People that have been here longer might be better known, and if someone's been in a number of roleplays then other people might have more desire to reply to their threads, because they know that person is good. You're just getting started, so don't worry too much if things begin a little slowly.