If you have slight claustrophobia you may find the B and J seats a little close as you are seated right next to the door. The actual window side seats (A and K, rearfacing) are more spacious around the head area.

What is your aversion to rear facing seats may I ask? As someone who gets motion sick I hate facing rearwards on trains and cars (don't even get me started on ferries) but I have had absolutely no issues with rear facing seats on aircraft.