I am trying to figure out if my CBC shows me having some kind of leukemia. Wbc is 12.5 lymphocyte 3.5 monocytes 1.1 neutrophils normal?

Review the smear. At age 31 this is a very unusual group of absolute white cell counts. I'd get with your physician and find out whether the cells all appeared normal. This may be an inexperienced or inept technician's interpretation of a smear from infectious mononucleosis. If you FEEL well, I'd urge the bloodwork be repeated, and if still very abnormal, a hematology consult.
Need more info. All laboratory results need to be interpreted in the clinical context and the doctor who ordered the tests is usually in the best position to do that. Having said that, WBC count or 12.5 per se is not a reason to consider leukemia. Examination of the peripheral blood smear would be more useful to exclude immature cells. If monocytes are 3.5% and neurtophils 1.1% what are the other cells?