How can I know my area of interest in which I can make my future..

Deciding what career you want to go for can be a tiring as well as really confusing job, but some important things to keep in mind while deciding your career are-

• Let your curiosity lead you to the things you love doing the most, and let it uncover your hidden talents and capabilities, and then analyse yourself and go for the career option you find most apt.
• Money is important but still it's a secondary thing, the career you choose for yourself definitely has to make you a living but the most important thing is that it should provide you happiness, and then obviously eventually money too.
• You should love your job, as in you should look forward to it every single day, and do everything you are doing with enjoyment, and not as if you are burdened.

That is your call, buddy. You need to know what interests you and doing what makes you feel happy. You also need to realise if that is just a temporary happiness or a happiness and satisfaction that lasts longer to give you a job. For example, I like playing PUBG. But I know that I cannot make a living out of it for the rest of my life. So, I play PUBG but continue my studies so that I know I can have a better future and a promisng career. And because I like PUBG, I can also get into other career options that will continue my association with games. That is also an option for you to think.