Am I worrying too much?

I’m a 30 year old female who is a massive over thinker! 

A few months ago I found a lump in the upper outer region of my right breast, I didn’t think anything of it if I’m honest but at my doctors appointment last week I mentioned it and she referred me to the breast clinic, which I have now on the 28th July. This particular lump is hard not painful but feels smooth so I don’t think it’s going to be Cancer however this morning I did find another lump on the same breast, under my boob pretty much where my bra line is. It isn’t painful and it is hard but this one does have irregular sides but I’m not sure if this is just because of where it’s located. 

I don’t think I have any other normal side effects, but I have felt more tired over the last few months, and I feel almost a tightness in my right armpit instead of your normal swollen lymph node. And my right neck lymph node is very tender. 

im hoping these are all individual issues and not related to Cancer in anyway but I am over thinking it and googling everything! Any one else had similar side effects or able to relate to my issue?