If I am a minor can I be screened for std's without my parents knowledge?

Depends. Yes, mostly. All 50 states have laws rhat allow minors to get tested and treated for stds, but some limit that to over 12 or14 yo. Only 31 states include HIV in that so the others require parent consent and 1 requires HIV + to be reported to parents. 18 states allow doctors the ability to tell parents about + tests overall.