I have been the same myself, but remember, if you use a johnny the risk is almost nothing.
I have had sex with some 30-40 escorts and never contracted anything from them - just goes to show, if you use a condom, you generally don't catch anything. These girls are fvcking many different guys for a living, but are the most careful when it comes to condoms. If you could catch anything with a condom, these girls would be full of disease. As it happens, I have had STDs, but every one came from unprotected with a normal girl, not an escort.
HIV - No risk
Syphalis - No risk
Hepititus - Risk for one type even through kissing (can't really protect against that), the other types need blood contact I think - no risk for those
Chlamidya - No risk
Herpes - minor risk, but if she looks OK then good to go
Warts - minor risk
I had warts and chlamidya. Warts came from rubbing genitals, not sex. Chlamydia came from sex.
I wouldn't worry too much mate, they aren't that bad, unless you get unlucky. Chlamidya is like a cold for your d1ck, warts, well is just like normal warts on your fingers etc. OK, they can cause problems but like 30% of people carry the virus. If you use a condom it is highly unlikely you will get them.
I am past the age of caring, except for nasty stuff like HIV etc. generally the nasty stuff needs some really hardcore unprotected sex or anal sex to transmit, so unless you are fvcking drug addicted street hookers unprotected up the ass, you should be OK.
If it was that easy to catch an STD with a condom, people wouldn't fvck and would go back to getting married. Chill out man.
Herpes is the one I don't want to catch though, apparently that is a nightmare.