Breast cancer urgent referral

Hi new to this 

my mum had breast cancer in left breast picked up after routine mammogram no lump was felt.  She had it removed and lymph node this happened a few years ago.

I was on the phone chatting to her when I said on my boob hurts and she said I must get it checked so I promised I would.  Made an appointment and went to see gp.  I am 46 and believed he would just have a feel of my breast and tell me it was hormonal changes and not to worry.  But he found a lump and I have an urgent referral to breast clinic with an appointment on Wednesday.

I am not worried about what they find but I am really scared that there is nothing and they just think I am wasting everyone time and was just being over dramatic 

i know that will sound mad but this is how I feel