i am giving an honest review , i know you have got inspiration from other novels but in other novels it was not blunt as your novel 1st chapter , atleast there should be emotions and all , in the novel mc got pain and he said 'argh just like that half an hour pass .....
after 2nd flaw - when you write you suddenly changed the perspective like 1st to 3rd pov it so sudden that it becomes annoying ......like from 'I' to 'He' and after he suddenly become a serene and calm as he was not got to surreal pain at least there should be some emotions man , it's like blunt - yeah i got transmigration yeah ... is it real ..oh yeah ... and also this he also know he is an 'extra' what does extra means in this .....i got it means side character but what does it sudden i am extra then i will steal the hero things or artifacts etc.etc.....i got this it it's too blunt at least edit your 1st chapter to get proper reading atleast ..if you don't like my opinion you can delete it but yeah you should read first your 1st chapter in reader perspective or read other novel where you got inspired ...