"I just had a biopsy, and I was told that I have prostate cancer."
Biopsy readings are subjective: what looks like cancer to one person might well look normal or like a different grade to another.
The most logical approach, if you have not already done so, is to arrange for another reading of your biopsy slides by an expert pathologist.
ie confirm where you really stand before even worrying about treatment options.
Secondly, obtain a printed copy of your biopsy report as it will contain a lot of relevant information like the number of positive samples, Gleason scores, and % of cancer in each sample.
All of this information will help you put your situation into perspective and assist in your decision making process.