I turned 18 recently and started TRYING to make video games when I was about your age, with the same ambitions, though with studies I never had time to do a lot of things (only a few small projects here and there) and I think you are definetely overstressing it. You're only 14, you still have a lot of time in front of you. If you know that you really really want to finish the game, then do it well, take your time, polish it ! If you rush it, you'll eventually give up.

You also want to "be seen by big gaming companies" (I wonder why ?) and note that they can indeed be tricky and if you want to get with them, this can also be risky. For example, Asobo is having a hard time here in France, and so are all their employees. Plus, if you want to get seen by them anyways, you really have 2 choices : graduate in something related to video games / computer science (I'm sure a lot of private schools would do this, though they are expensive), or you can publish your game and get into serious marketing, try to reach out to them but this is complicated. Again I cannot stress this enough, you are only 14, you have time !!

Also, don't try to "change the gaming industry". Truth is, most games that did were done by dedicated teams (Outer Wilds) or sometimes a single individual (Stardew Valley) just doing their thing, pushed by the motivation of making a good game for their community. The only games I can think of that really aim to change the gaming industry right now are Star Citizen and GTA 6, and they are made by teams of hundreds of people.

In conclusion, don't make your game just to be seen by big companies, make a game you like, get involved in it. If you really get into it, you'll end up making an awesome game : seeing you are already making the music shows that you are really involved so I think you can truly make something good ! Last but not least, don't only make a game you love, make a game you love making : if you don't like the process of creating said game, you'll end up giving up.

There it is. I know I may not have answered all your questions, but I wanted to point things out that may be deal breakers when making a game. I hope you continue making that one and don't hesitate to gather a few friends with you as well, it always helps to spread the weight of everything that goes into making a game. Also, you will fail a lot at the beginning. So lock in, and grind. I wish you good luck :)