You had protected sex, correct? That means you were protected, safe and it is of no surprise your tests are negative. That won't change. You have no symptoms of an std, you can't get HIV from protected sex, the only symptom you have is that of obsessive thought as it relates to anxiety. Treat your anxiety and things may get a whole lot better for you.
Using a condom means you had no risk for HIV, gonorrhea, chlamydia, hep B, NGU, mycoplasma, and trich.
It means you had significant protection against syphilis, herpes type 2, and HPV.
Hsv1 is transmitted by oral sex, when someone with oral hsv1 performs oral sex on someone who doesn't already have hsv1 antibodies.
You weren't at risk for hep A or C. Hep A is only spread by fecal matter, and hep C is only spread by blood. Both are rarely spread sexually, and when they are, it's usually unprotected anal.
You don't have symptoms of syphilis, which is conclusive at 6 weeks, and that's uncommon, so I wouldn't worry about that. Same with herpes, which most people test positive for by 6 weeks, though it can take up to 4 months. There is no HPV test for men.
So long story short? You're fine and I wouldn't worry.