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I‘m 15 and have a rating of 2600... do you think I can become a GM?

Your younger than me so you just might do it. JEEZ 2500 phew I don't want to challenge you.
1900 fide, play more tournaments, work hard to get 2200 and CM.
Lichess ratings r irrelevant for an OTB title
Then go from there.
Let me interpret this to you from my teen translator:

"Hi, i'm younger than most of you, but i'm better than most of you will ever be."

There, i saved you a lot of trouble...
im going to be kinda straightforward and honest.

Yes, you have a rating of 2600 in bullet. No, it does not mean anything - the bullet rating really does not mean that much in classical chess.

Yes, you do have a chance to go for titles if you study consistently every day. However, if you only put in like on hour a day, the titles would potentially never come.

Am I saying that you should spend your entire day studying chess, for the rest of your high school years, and forward?

No. It really isn't worth it, speaking as a 16 year old myself. You are only going to distance from your academic and social life, and the time put into it really isn't worth it.

1. First, getting GM, on a financial scale, you would not make much unless you were a top *top* player
2. Time, time, time. The amount of time I've seen young people who get GM (mostly homeschooled in the US) is insanely high. Even though I was committed to chess before I went to high school, I still couldn't get as much time as them (they were doing like 7 hous a day) It is a lot more worthwhile to put it into something else

If you enjoy playing chess, that's completely fine, and you should enjoy it as a hobby. However, I really don't think it is practical (even for me) to go for the GM title.
it depends. it can be of some use, you still have the possibility of having free time, so using it to do something that you love and with which you can have notoriety in the future is quite interesting.

focusing on school studies doesn't get you very far.

Yes you will have learned maths, one or two foreign languages, chemistry and biology... but where will you go in 10 years? in business, to live a nightmare life and forget the word vacation? to do odd jobs? to be unemployed?

so decide if you want to go to university and in what field.

if you want to become a pro chess player, you can think about the faculties of psychology, maths/statistics, economics, law or even pedagogy... because it could be useful to you in case you do not become a top world GM but an average GM : you can become a coach, author of chess books, referee, or you can even have two professions: statistician and chess player for example. that way you won't be deprived.

don't focus only on school. Don’t try to get “A+” on every weekly test. try to get an A+ on the last exam, the most important. be opportunistic and anticipate your higher studies according to your qualities, in this case you will be able to devote more time to chess, especially since most universities have chess clubs.

having an artistic or sporting quality in addition to your education will save you, and make your higher education easier. I say this from my own experience (musician), that having the certainty of your future profession (even if in my case I study in the faculty of music at the university) and living your profession/passion on a daily basis is a joy.