Firm not very moveable lump on my breast. Have appointment at the breast clinic on Friday and I'm so, so, scared. Has anyone had anything like this?

Hi, I’m 27 and about 4 weeks ago I found a lump on breast where I have had a love bite, I only noticed it because it was still a bit green. If I touch it, it does dimple slightly. I have my appointment at the breast clinic Friday and I’m so so scared :( 
I do already suffer with bad health anxiety and I’m so down and upset as I just annoy everyone I talk to about it :(. 
I wondered if anyone else had anything like this before?   
But really I just needed a vent.