If you have cold sores--you DO have herpes. You have Herpes Simplex Virus-1 (HSV-1, oral herpes/cold sores/fever blisters). They are all the same thing.
You are harboring the virus--it lives in nerves beneath your ears. Occasionally, it will pop out as a cold sore. The virus spreads easily--because the fluid in the cold sore is loaded with the virus, so if you touch the blister with your fingers or it touches another area of your lips, chin, nostrils, eyes, you can spread it there.
Chances are you have had it since you were a kid. We get it when someone kisses us or sharing toys, foods, drinks with playmates/schoolmates. About 80% of the population does test positive for it, 56% of teens do, and by age 50, 90% of people do.
Just treat it as you did the other, but never, ever, ever touch the sore with your fingers! Always use a Q-tip. That will help keep the virus from spreading.