I know I am going to take some abuse for this reply, but I'm going to make it anyway.
You would be a good addition to our fellowship based on your boosts, but are just too small and new at this time for us to accept. Most of our players have already established themselves and are progressing nicely. We have a few small players, but cannot afford to take on any more beginning players at this time.
My suggestion would be that you APPLY to some of the fellowships where most of the members are new or small and accept the one which takes you (if it had one or two larger players at 15,000 points or more that would be a bonus for you).
Grow as quickly as you can and if it seems that others are not growing nearly as quickly as you are or are not helping each other through neighborly visits and trades on a daily basis, then leave and find another fellowship. Leaving is easy and if you have grown sufficiently, a higher ranked fellowship will definitely be interested in adding you as people leave the game all the time and good fellowships are always looking for good people.
Prove that you will be an active, contributing member of a fellowship and they will be knocking on your door.