Man, first of all don't worry, 90% of the people here are "new to escorting, and basically a virgin".
Personally I believe that the first time is better to have an authentic experience with a person you like, but if you really have decided to lose your virginity with an escort, my humble advice is to avoid porn stars and choose a professional, preferably not very young, because they usually have more experience in these situations and also more patience with beginners.
There are many reasons why I advise you not to start with a pornstar, but the main one is that, since it is your first time, you will certainly be very nervous and being faced with a "famous" pornstar will only increase your nervousness. Plus, since it's your first time, you might also find that escorts aren't your thing. In this case at least you saved $2k or more
Last piece of advice, your "performance" will last a few seconds, make sure, pornstar or not, that MSOG (pop more than once) is allowed. In any case, good luck