My Soulbound Spirit Is Somehow Me

As someone who transmigrated to a parallel universe, there's one thing the protagonist is grateful for. At least he transmigrated into his parallel-universe self, rather than someone else. Just as he was congratulating himself on dodging a bullet, he realized that sooner or later, he would have to pay for it... The stars in this world possess a special power that can evolve the genes of living organisms. They can also grant nonliving things sentience and the power to take human form. The people of this world call this power Star Essence. Humanoid and non-humanoid beings with Star Essence crystals inside them, called 【Starlight Cores】, are known as 【Star Spirits】 and 【Star Beasts】. But after the protagonist awakens his innate contracted spirit, he realizes something is wrong... It seems his innate contracted spirit is none other than himself! To his surprise, he is also found to have no affinity for any type of Star Beast except fantasy-type Star Beasts. In other words, for the rest of his life, he will basically only be able to command his innate contracted spirit: himself. Fortunately, the very next moment, the protagonist awakens a System. It's just that this Star Beast is a bit of a pain...