I suffer from prostatomegaly. Is it cancer or something else dangerous?

Big prostate. Welcome to middle age bro. Enlargement of the prostate happens to many (most?) of us as we get older. Most of times is benign and more annoying than anything else. Sometimes needs therapy to manage symptoms. That is not to say you cannot get cancer. Talk to your doc about your cancer risk (depends on family history, ethnicity, and other things) so the proper evaluation can be made on time.