Feelings can be complicated and for many it is difficult to express and label emotion. Men are actually four times more likely to struggle with this than women. Many times feelings will be felt as symptoms inside the body like a stomachache instead of being noticed as a feeling. Most of the men I work with are good at identifying anger as emotion but struggle more with other feelings.
A feeling wheel can help people label their feelings and understand the relationship between different feelings. This wheel divides feelings up into general feeling categories and allows you to pick out the appropriate feeling word by intensity of feeling (angry versus enraged) and also shows the spectrum of feelings from one category to another (like confident and thankful).