Sharp Pain in Breast

Good day

About a week ago I started having sharp pains in my left breast on the outside.  When I did a self exam I felt a little lump.  Sometimes when a I bump it against something or when I pick up my child or sleeping, the shap pain shoots thourgh it.  
I've heard that breast cancer in most cases arent painfull, but do I still need to worry?  Ive never had these pains before.  I dont feel it all the time just when I bump it.

Im 33 and had a baby about 2 years ago.  Ive only breast fed for about a month.

Do I need to worry?

[Cleveland Clinic]

Dear Onbekend, Over the internet without ability to evaluate including physical examination it is difficult to say what is causing your discomfort.    Breast pain is a common breast symptom.  The reason for breast pain is not clearly understood, and is not usually associated with breast cancer.  Breast pain is sometimes associated with hormonal variations and is then called cyclical breast pain.  Noncyclical breast pain does not seem to be linked to hormonal variations and is often localized to one area of the breast tissue.  Noncyclical breast pain may or may not be the result of an injury to the breast. You also mention that you found "a little lump on self exam".   In general it is advisable that a new lump  be followed up on.