hmm... trouble expressing emotion is often associated with disorders such as autism and aspergers. but that doesn't like what you are experiencing to me. it almost sounds like ADHD. Is it that you literally cant bring urself to feel the emotions? or that you know what you should be feeling and its just that you overlooked it? ADHD has issues with impulsivity, which results in the inability to express emotions at the approptriate times, either because of lack of focus on the matter at hand, or because of impulsivity, often are susceptible to what seem to be rather wild mood swings. but there are man disorders that can effect social skills and the regulation of emotions. i would ask ur t. maybe he/she has noticed something and has some insight