My breast are really sensitve! Am I going through Menopause?

Hi,

My last period was on December 19th. My breast have been extremely sensitive since my last period. My next period is due sometime between the 10th and 15th of this month. Why have my breast been so tender? I am 33 years old. Is it because I am aging. I am not on any medication or birth contrlo. Please someone let me know what the reason could be.