Well at your age of 23, this is very Unlikely to be a cancer but If you have not had a biopsy of this breast lump and if you have not had Imaging such as an ultasound or a MRI - this should be done.
So if you are having Pain and it is Not improving - you definitely need to get seen - and if you want - you can safely take medication such as Ibuprofen (same thing as Advil or Motrin) and you can Add Acetominophen (same thing as paracetamol) to help this pain.
Also, if you have a single lump this should definitely get a biopsy to make sure it is benign and not a cancer.
I wish you well
Please if you have more questions, please ask
I would make an appointment to get this more fully evaluated so that you do not have to go through this pain any more.