do these personality tests really turn out to be true?

I don't believe so! Think about it.... Most of them use mutiple choice questions and then ask you to add up all of the A's, B's, C's and so forth to determine your score. How many times do you find that the answers do not quite fit how you feel or do not quite fit with your opinion but you choose the answer that is closest.... Human beings are far too complex for a generic personality test. I certainly wouldn't rely on them but think that it is a fun process every now and then!