Indeed, the leaning is probably imagined. One's metal sense of balance in terms of pitch/roll is very easily mislead when flying.
Regarding pitch and trim; with the exception of the HS 146/Avro Regional Jet which I believe tends to sit more nose down (compare nose attitude of one on approach with a 737 to see the difference) than other jets almost all large jet transports fly several degrees up. The trim of the aircraft changes all the time...something as minor as someone walking from one end of the plane to the other can alter it.