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Read through the most famous quotes by topic #string theory
As you say, the way string theory requires all these extra dimensions and this comes from certain consistency requirements about how string should behave and so on. ↗
String theory is an attempt at a deeper description of nature by thinking of an elementary particle not as a little point but as a little loop of vibrating string. ↗
Technically you need the extra dimensions. At first people didn't like them too much, but they've got a big benefit, which is that the ability of string theory to describe all the elementary particles and their forces along with gravity depends on using the extra dimensions. ↗