Asking for advice

Me and my boyfriend are both 18 we have been together for little over 3 years . We are sexually active but have no where to do it but a car . Which sucks we've had it lots of time in the car and now I'm over it. We used to at his house till he moved and now we cant . The car is so small and he's 6'1 so not really tall but tall enough and I'm 5'1 but not small enough to ride him in a car so the position not the same and we can move and I'm just over it . He on the other hand wants it no matter where or how . So I was wondering if anyone had any advice on making car sex better or more fun and more private ???