Chances of getting STD

Patient: I would like to know what are my chances of getting an STD.I am a straight guy currently 22 years old, had a total of 3 sexual partners in the last 3 years. I had sexual intercourse without condoms almost all the time when i was still with my sexual partner. We had sexual intercourse, and oral sex. Nothing more nothing less. I don’t have a regular sexual lifestyle, but i dare not say the same about the 3 partners i had. My last sexual experience was 18 months ago. There were no obvious symptoms such as genital bumps, or sores on lips etc.. What do you think are my chances of getting an STD, like Herpes? If i want to do some check-up, what kind of tests should i go for?