Exactly HOW low is my low lymphocyte count?

I have my full CBC in front of me – very recently done – and it says my lymphocytes are 10.2 %, and that the Reference Range is 20.0–53.0 %.

How low is that? Is there someone with medical knowledge that can better explain? Is my result something to be worried about, or is that in the “normal-low” range?

I apologize ahead of time for the medical questions I might be asking. I’m overwhelmed with tests and appointments and specialists, and sometimes I forget to ask for clarification because I have so much going on.