Nothing is predestined but there are high and low odds for most people. For example, me and my brother. From what I have been told, I was a very noisy, energetic, loud baby. According to my mother I was the loudest baby in the hospital. As a baby, when I woke up in the middle of the night, I was crying so loud it was impossible for my parents to continue sleeping. So for a baby like this, being rebellious, fighting with other boys, being physical, blunt and cruel are high odds. My ascendant is Aries and my Mars in Leo by the way.
My little brother is my polar opposite. He was the most well-behaving, silent, always smiling baby ever with red chubby cheeks and innocent big eyes of his. So for someone like this high odds are then being sensitive, getting bullied (including by big brother), being a good hardworking student etc.
At school, as a kid, with way more energy then I can control I struggled. In fact I didn't give a **** about school. If I tried and failed, that would be a struggle, I simply didn't give a ****. I was totally, completely overwhelmingly under the effects of this high voltage, sparkling, very very impulsive mood, I simply wasn't thinking, I simply didn't think future, I never been a worrier, I always lived in now and I still am.
Now, you can use this excessive energy in many different ways. You can continue being a tramp all your life, you can study martial arts, You can be a soldier, you can be an olympic athlete, join the gang and sell drugs and get into gun fights and die or be a cop and kill those very gang members!
And if you were my brother, you could fall in depression thinking you fail as a man, You just don't have that masculine, careless, risktaking energy, you worry like a girl, you read what's in this chocolate and if there's fructose in it you wouldn't eat it, you would produce dang load of stupid habits and pet peeves because You are just not in peace with yourself or You could accept this low, rather feminine (He is a pisces) energy, be good, be nice, be friendly, be tolerant, be humble but no, if you insist and try to be your big brother then you fall into this complex, your soul and your persona always fight with each other.
Good, knowlegable parents could see where these kids were going (psychologically) and guide them and teach them how to deal with themselves.
Astrology is not just your natal chart. There are transits, there are other people's charts, there's synastry between their charts and yours, your chart might suck, some other person's chart ***** harder, so there you go even though your chart sucked you dominated that super sucker.