You say that you are playing ... Where? Which club / sports school? Positions are not an indicator, but experience, skill and intelligence in football are valued much more (especially the latter). At 19, there are still chances, but they are minimal! To get into professional football you need: 1. Find out where you can go to the club. Every year, clubs (2nd, 1st and other leagues) arrange a recruitment to their club. “Zenith”, “Krasnodar” and others are no exception! The only question is age and what they will demand. Find out in your city (nearest district, region of the city or going to another country) where the recruitment of a football player for your age takes place! Call, find out when it will be, what to take with you and what is required. Also take into account the teams of the 2nd (in Ukraine Premier League, First and Second) leagues, because it is easier to sign a contract with them and they always need good football players!
The main thing is to find a club that makes a set of players of your age! Or then knock on the door yourself to open it for you. Remember, the set will be very large and you will need to give all your best and not the fact that you will be taken. The selection can take place in several stages.
Your situation is very close to the position of artists in films - an actor really wants to act in films, but little depends on his desire. The producer or director approves his role. The career and fate of an actor is always in the hands of strangers and depends on their tastes and preferences.
The fate of a football player depends entirely on coaches and sports managers. If they see you as "potential" ie. if you can turn into Cristiano Ronaldo in the future, then you will be promoted and contribute in every way to your career. If they do not see anything in you, then you will play for the whole life in the national team of ZhEK # 9. Moreover, what you think of yourself interests only you and your mother. You won't be able to promote yourself! This will ALWAYS be decided by other people's uncles with big wallets and irrepressible ambitions.