I’m 25 and have a breast lump

The other day I found a small lump in my breast, my mum and boyfriend couldn't feel it. I went to the GP yesterday and she confirmed she could feel a small lump, and that it would mostly likely be a cyst, however, I'm so anxious and worried I could be cancer. I am a bit of a hypochondriac over health and I feel as though I'm losing my mind worrying. I'm still waiting for my appointment at the breast clinic, if they haven't been in touch in 3 days I'm told to ring up myself. Was wondering if anyone around my age has had any similar experiences? I haven't been through this before so I'm really scared and I feel overwhelmed.