Does Pressure Between Penis And Rectum Indicates Prostate Cancer?

I think this is a urology question. I m 38, male, caucasian. About four days ago, I started noticing something at the base of my penis--between the penis and rectum. I don t know if i d call it pressure, it s more of just noticing the presence of a feeling of some sort, no discomfort. I went online, and of course got freaked out that it might be prostate cancer. However, there is no blood in my urine, I don t have any trouble peeing, and there is no blood in my semen. I do occasionally wake up to use the bathroom once a night...maybe 3 out 7 nights a week, but that s been happening for years. I ve had sex with two people a long time ago, so I don t think it s an std. When I wake up in the morning, it s barely noticeable, if noticeable at all, but then around five or six, especially if I ve masturbated, I notice it again. I masturbate once, sometimes twice a day. I also do not have any pains in my abdomen or groin or thigh areas.