Was diagnosed to have atherosclerosis but ct angio results were mixd plaque w/o stenosis & right dominant circulation. i am worried, please explain.

Well you have: Coronary artery disease ; no flow limiting blockages but you need maximal lifestyle ; medication management as you are at higher risk given your young age.

Plaque: If you have documented plaque, you have atherosclerosis, more specifically, coronary artery disease. It is good that there is not yet a blockage. Aggressive risk factor management including heart healthy diet, exercise, smoking cessation, and lipid management will help stabilize the plaque and prevent events.