I don't want to discourage you, but becoming a professional chess player at the age of 30 is as good as impossible. It's like saying I want to be a ballet dancer or a professional musician when you are almost in your mid life If you want to become a pro, you have to start at an early age. Certainly before you are 10! And you've missed that boat I guess... If I were you, I'd make something else out of my life.
admit it, there is a difference. chess can be LEARNED. it is an intellectual activity. it can be learned through very hard work and through lots of motivation. all you have to do is solve problems, learn opening theory solve lots and lots of endgame problems and you are already a competitive player. ballet dancing or being a musician require tons of equipment and access to training which is maybe available once a week. however, with chess you can practice any amount, up to 7 hours a day. it is much more possible given the motivation and ability.
Why are you looking for permission?
The people who think you can't will always say no you can't, AND you shouldn't even try, even though every cell in your body says you can.
They will give you every reason why you are deluded. Maybe you are! Who knows? Who cares? Just do it. Go memorise 10000 gm games. Read everything you can. Play with players better than you. If you are ready to spend the next 10 years at it, and then finding out you are not that good. If you can live with that, after years of struggle and then to discover you haven't got what it takes, then you don't need to know anything else.
You are trying to convert disbelievers. They don't believe it is possible, what do you think they will say, all of a sudden out of great love and compassion for you they will burst out in a triumphant joy and exclaim, "Yes! You want to be GM! Great! I will help you all I can! I will applaud your success, and I will suffer in your sorrows."
That is the only delusion you might have. That people have any personal concern about your success.
If chess matters to you and you want it to be a big part of you life, just do it.
If you want guarantees, then you won't find it. If you want your fears to be allayed, and be told, that yeah you'll be fine, nothing can go wrong. Then you are mistaken. But it is worth trying if it gives you the oppurtunity to overcome your doubts and uncertainties. You may not become a gm, but at least you'll overcome your self doubts, fears, etc etc and that has to be worth something....
It's very weird people only see the good sides of things, never the labour and pain and tears that go with it. You work for something like 20 years and then someone says: yeah, I want to do your work It's nice, pretty! I'm talented, I can do it. Sorry, but no, that is not the way it goes. If you are special, then you would have made the decision to become a professional a long time ago. It is about being possessed by something, like I said before.