really depends on what country you live in and within your country what's offered. Most places in the world offer anonymous HIV and STI testing. Nothing to be embarrassed about and can be scary, but it's well worth your time and efforts. Remember it's not only for you, but for the people you're hooking up with. IF you live in the USA or Canada or some other countries, you can either order a test to your home or even go to the pharmacy and pick up a test (if in the USA or Canada, you can use the oral test and find out right at home within 20 minutes).
Please get tested.