I Am 47 Years Old. I Am To Scared To

I am 47 years old. I am to scared to tell anyone in person. I have a growth in my penis on the left side. It hurts to pee. It's growing in size. It's about an inch in length. If I get a hard on its painful. I can't tell my girlfriend or my doctor in fear of the worst. What do you think it is. I am not joking it is painful. I'm scared.