Your activity was unlikely to result in an STI. FYI, chlamydia sometimes presents with no symptoms. It sounds like you are going to become sexually active in the next year, so it would be a good idea to strike up a relationship with a gynecologist for an annual checkup. Planned Parenthood would do the same.
It's a good idea to discuss sexual history before becoming involved. It's also best to agree to a monogamous relationship, with notification if there is any straying.