Someone else's experience and advice may not apply to your type of cancer. Listen, but do not base decisions on their advice only. Be sure you have information from your physician on your cancer. Be sure that your advisors are trained to understand different treatment options. There is no one standard treatment for all breast cancers.
Many factors affect treatment decisions.
After you know the specifics of your type of cancer, you can get information from organizations that specialize in accurate information. See the reference section and other suggested on-line references for breast cancer. You can only know when you look at all the advantages and disadvantages and decide which treatment fits your lifestyle. Another woman may request a mastectomy to avoid going to a clinic for weeks of radiation therapy after surgery. Discuss with your health care team your feelings about the various options.