The only risks for HIV in adults are:
1) Having unprotected anal or vaginal sex, or
2) sharing intravenous needles with IV drug users.
You did not have a risk for HIV. Even if you engage in multiple no-risk events, zero risk x 25 = zero. A no-risk event does not increase just because you do it multiple times.
As expected, your tests show that you are negative for HIV since you were never exposed to HIV. I'm glad you use condoms for penetrative sex - keep being safe!