I have a tendency to be too serious at times. I'm pretty sure most of us have that tendency, probably even comedians get really serious from time to time. There are some people though, who take everything way too seriously. They are always pouting and never smile, they can't take a joke, they don't know how to laugh, they get angry at the slightest disagreement, etc. I have met these types of people, and they are not fun to be around. I had to be really careful not to grind their gears, and it took a lot of effort. Compared to people who have even a slight sense of humor, I would rather be with them than the people who are too serious.
I, myself have been mistaken as a person who was too serious by some people I knew(must be because of my serious face which people commented that is scary). These people are usually just acquaintances and they never hung out with me. When they did and they found out that I actually can laugh, they get really surprised at my sense of humor and my tendency to laugh a lot.
The reason why I have a sense of humor and laugh a lot is because I learned that:
•Laughter is the best medicine for any bad day
•The most memorable times I have with my family and friends is when we laughed our heads off
•People will like you more if you can make them laugh or at least if you laugh with them
•You will be a lot more attractive to the opposite sex if you have a good sense of humor
Trust me, being a person who is too serious is not fun at all. You will tend to hate everything and you will be unhappy with your life. Stop it and go laugh out loud. You'll be glad you did.