I think you messed up either the location or time of your date of birth. Sun in Scorpio means you're not Sagittarius. The website where you got that chart will probably also give you a breakdown of what everything means.
That chart Baal had posted looks like it's using a Vedic model as opposed to the Tropical House system most common in the West. I had a conflict myself with the variance when I was learning, because if you calculate a chart based on the position of the planets in relation to the
constellations, then you will get a completely different set up. Thus, a Saggy will be a Scorpio, or an Aries a Pisces. But the House system is based on Signs named
after the constellations, the latter of being more useful in terms of the fixed stars within them - which can be interpreted in terms of a weaker and modified planetary sense and can predict things like blindness, violent death and herpes.
I prefer the Tropical House system because it is like a giant clock where the energies are based on seasonal influences and interactions as opposed to an uneven patchwork of borders in the sky. Speaking as an Aries myself, I can say the fact that the constellation Aries is so small that it really
pisses me off. I mean, how fucking dare they? Why does Pisces get to be such a gargantuan monster?
I have read astronomy books and seen docs where the scientists argue for the falsehood of astrology because this variance of constellations vs. Signs. They easily confuse the two with educated flare, pointing out how the procession of the Equinoxes is constantly moving, so the old ways of stellar calculations are at the very least obsolete, and any meaning to them is just superstition. But the last clause of "superstition" was the starting point for the dismissal, so no detailed analysis of actual practices is needed. I find it enlightening when an expert can confidently discount and dismiss something they know next to nothing about. I loved James Burke's
Connections series, but as he explaining astrology using a big table and little models of the planets, he picked one up marked with the symbol of Mercury and called it the Moon.