First things first, just a quick clarification, there is no such thing as a provisional patent, but rather a provisional patent application. It's a slight difference, but an important one. A provisional doesn't give you any direct protection apart from securing a "priority date".
To answer your question, though, no, the provisional application will be made public if and only if you proceed to file a non-provisional application and claim the filing date of the provisional. Of course, this typically isn't a big deal since the non-provisional is often a more smoothed out version by that point anyway, and it will be published according to the schedule you select, or at the eighteen-month mark by default.
If you don't file a non-provisional that claims the original provisional, nothing will happen with it, and it will essentially just disappear.