Doubt is a fine state of mind in science[1]. The worst denial in history was the reluctance to accept germ theory, despite presentation of evidence that sanitizing led to wonderful things like decreases in infant mortality. It is important to note that the acceptance of germ theory was a result of hundreds of years of scientists and doctors presenting evidence to the contrary that the believed theory of bad air was the cause of disease, and not political yahoos typing furiously onto forums that they possessed doubts.
If you doubt anything, even something controversial as climate science, I salute you. Take those itchy fingers and those doubts and pry open a textbook. Learn as much as you can about the phenomenon. Ask questions. Lots of questions. But also be prepared to learn.
[1]I have no idea why people bring up Galileo as a bastion for doubt. The man was a hardcore Catholic and was unable to provide evidence to back up his astronomical theories when asked. Without this evidence, he felt free to ridicule his opponents. He also (surprise, surprise) felt free to accuse other astronomers of seeing things that weren't there, like comets.