so like 170-180? im assuming. correct me if that doesn't sound right. 170 is actually pretty average. bring that 150 is supposedly the average more than likely there's no real difference beside more booty and maybe thicker/softer: thighs,arms and belly. im sure you're nervous but just try to focus on having a good time and making each other feel good. im abt 170 myself and there's not a lot me and my fiancé can't do. (tmi sorry) but we're both decently fit and workout weekly together. so besides taking things as they come and focusing on enjoyment first is ur best bet since no one knows exactly what this girl looks like and her levels of flexibility, fitness and hygiene are.