I have read before that breast cancer is usually not painful
Sorry, I just have to say, you can get pain with breast cancer. The only way you can tell if changes in the breast are something sinister or not is to get them investigated properly. Google is bloody useless!
I have just been diagnosed with breast cancer. Several people told me (including Dr Google himself!) that my lump wouldn't be cancer because 'cancer lumps are usually irregular' and mine was smooth and round. Conversely people have been to the breast clinic with an irregular lump which has turned out to be benign.
The point is everyone is different and, as I'm quickly discovering, on a personal level statistics don't mean anything! But the important thing OP is that you are being checked out. Statistically, it is unlikely to be cancer, as others have said 90% of clinic referrals turn out to be nothing. Quite a few people I know have had breast lumps investigated and they have turned out to be nothing. But if it is cancer, then it is, and you will get good treatment, you will deal with it and hopefully it will get sorted.
Sorry, I'm not sure this is the best post for this thread, I have been debating whether to hit post for ages! But I think it's really important that people know that any change at all could be a sign of something that needs urgent attention. And also as a voice to say that if it is cancer that you can still deal with that too and you can't change it - I'm doing OK at the moment, the world has not ended for me, it's just on hold for a little while! In fact if it is cancer then a diagnosis is the best possible outcome as it would be there whether it was diagnosed or not iyswim!
All the best OP, I hope this post isn't inappropriate, let us know how you get on x