Personally i know I'm arrogant and many others have told me i am also, no one believes I can make it except me and literally 3 people

Keep this mindset. Hold onto it. Don't let anyone else take that away from you. People will become more creative with ways to pull you down. Saying things like, "You know only X amount of people actually make it" or "what happens if you don't" etc. Look past those and keep to your ways.

Apply this to all aspects of life, but learn when to be humble. If you're clearly bested by someone else, be humble, concede they are better, but work to improve and overtake.

You can't second guess yourself and your abilities, the second you start doubting or lacking confidence is the second you start losing the fight.

I've asked my coach on advice and he tells me everything is good but tracking back. To me it's stupid because I know i surely would have made other mistakes.

If tracking back is the only issue he has, then that's the only thing you need to focus on. Sure, everyone makes other mistakes, but your coach has told you he doesn't care about the other mistakes, a misplaced pass or one or two bad first touches don't stand out to him nearly as much as your lack of tracking back.

Its great you're asking for feedback, but don't dismiss the feedback because its not the feedback you expected/wanted to hear. Take the feedback you got back, make it a priority to improve, and then continue fixing any flaws you think you may have.

Oh and my team now? 10 weeks in and were 13th out of 16... I've scored the most goals in my team so far

You're the top scorer on the team, your biggest weakness is your lack of tracking back, and your team is 13th out of 16. If you're making such contributions going forward and your teammates are looking to you to lead the team for scoring/creating, they're also going to look at your defensive work, too. It sounds like theres a problem defensively on your team, could be the result of a myriad of things. New players, new system, players out of position, etc. But it seems like there's a correlation between your coaches primary concern with you not tracking back and your teams current season position. So even though you may see it as stupid, theres clearly something to be learned.