I have a theory that star signs personality profiles listed on internet and in books are not that true...?

You are exactly on track. Those bits and pieces of personality generally omit the big picture as everyone's chart is unique. A natal chart is the sum of many parts. Oh how I got so frustrated when I began my study of astrology. Every characteristic I read always contradicted another characteristic. Oh it was frustrating. But I hung in there and now am much better. It only took me thirty years! lol Many people don't find confirmation in their sun sign. You sound so much like a Scorpio. When I saw all that Libra in your chart this helped considerably in explaining why you are the way you are. As you age, your inner planets progress into the next sign. With your Libra Moon (emotions) and your Libra Venus ( relationships) they probably have already progressed into the next sign of Scorpio. This is one reason why you are so Scorpio-like. And also, where is Pluto in your chart and what aspects does it make to your planets? If you have Pluto close to your sun then you would tend to be more like a Scorpio than a Sag. Your question is full of Scorpio characteristics, The secretiveness, the desire to hde emotion, the bluntness, the jealousy, untrusting, wanting to be a "closed book" until you trust one enough to share your feelings. And that does take a long time for a Scorpio as Scorpios are deep. Very deep. Take another look at your chart and see where Scorpio is and also see where Pluto is (the ruler of Scorpio). Don't discount astrology. It is often a great means to an end. Good luck. Will be looking for you questions. Bless you.