>>951951They don't know your dick size till you take off your pants. Seal the deal before then. Be cute and charming but be forward and use some innuendos while you grab a drink.
Exude confidence and be forward. If you go in for a kiss, make it passionate af, watch your breathing and timing. Listen to her body language. Grab her ass and pull her toward you tight.
When you actually get to a bed or flat surface, immediately start teasing and fingering. If you get her hot enough before actual sex she'll just want to finish and won't care if your dick does the job. Finish with fingers and oral and she won't out you if you're good.