Can i get std's (hpv, trichomonas, hepatitis, gonorrhea etc...) from touching someone else's urine and then fingering my self?

No risk, no worries: STDs are not transmitted by fingerin or in urine (which inhibits or kills most STD bacteria and viruses). Don't worry about it.

Caution : While in above circumstances risk of transmission of STD is low, regular hygiene should still apply as fingers are to be clean at all times, specifically when accessing body cavities as the risk of mild trauma and bleeding remains possible.