Are certain Non Jewish People destined to become Jewish by Gd and how rare is it or are you born non Jewish because Gd would prefer you not to be Jewish?
As opposed to Christianity and Islam who both want to convert everyone, Judaism is contrarily extremely tolerant towards other monotheists in general, and aren’t interested in the least in converting anyone to Judaism! The reason is simply that every group is important in the harmony of the world. Just as Kohanim (priests) can’t be Levi’im (priest assistant), and also regular Jews should be satisfied with their important role, similarly there is a beauty in manliness, as there is in femininity, and each role is unique and necessary. God loves you the way you are, and that's why He created you that way. There is a necessity and an important role for most people as gentiles, and that’s why we aren’t interested in them converting to Judaism, and even try to persuade them to change their mind. Only if a convert is really adamant in their sincerity, we would allow them to convert, and they are 100% Jewish, because Free-Will is also an ideal! In such cases, we say that retroactively, it turns out that he may be one of those rare cases whose soul actually did stand at Mt. Sinai, and somehow was "lost" over the generations, and is destined to return. On the other hand, I suggest first being happy with who you are. Although it's very beneficial morally, and sometimes even socially, economically, etc., Judaism is meant for those who are born Jewish or those who seek truth, not for those who just aren't happy or feel that something is missing.