Sarcasm usually has a bite of mean-ness behind it. Sarcastic people like to think of themselves as being clever and funny, but often they’re just tactless and lack the ability/desire/maturity/patience to think things through in a way that will be useful or beneficial or kind.
Humor can be a wonderful thing, it can bring people together and bridge gaps and make people feel at ease and temorarily ward off sadness and despair.
There are many different kinds of humor, but I think sarcasm is kind of the lowest form of humor. I see it as Look At Me! humor rather than, Have you ever thought about fill in the blank—in another way? humor. It’s Jerry Seinfeld vs Don Rickles. It’s Ellen DeGeneris vs Joan Rivers.
If you feel like you are being too sarcastic, first ask yourself why? Do you feel the need to have attention focused on you? Do you feel like you don’t know enough about the world to make better humorous statements that don’t harm people’s feelings? Do you feel nervous and/or impatient so that you just blurt out sarcastic statements? Once you understand why you feel the need to be sarcastic, you can make a conscious decision to change.
I agree with @jca that listening to sarcastic or snarky comments on a regular basis can be very tiring and draining.
What is kind of interesting, here, is that I would not have pegged you as being a sarcastic person. Why do you think that you might be?