I have MONO!!??

So my symptoms began about Monday or Tuesday it was just sore throat and a noticed tonsil stones which I had before… and was fine next thing you know I’m experiencing swelling in my neck the lymph nodes I believe added with being sore and back pain but I go to the gym so I assumed soreness. I am single and it’s been a bit of a drought I haven’t kissed anyone in about 3 weeks. Finally today my mouth is in so much pain I can barely swallow there is blood more stones I go to urgent care and test negative for strep they say no tonsillitis go ahead test me for mono and POSITIVE I was in such shock I have absolutely no idea how I got this or who from I feel weird people keep saying it’s the kissing disease asking who I’ve been with ☹️