I'm not sure specifically which 'main khayal hoon kisi aur ka' you are referring to. It could be a song, a poem, or something else. Without more context, it's difficult to tell the full story.
If it is a song, without listening to it or having more details about its lyrics and the context in which it was created, it's hard to give the full story. But generally, a song with such a title might be about unrequited love or a sense of self - effacement where the singer feels like they are just a thought in someone else's mind, maybe longing for that person to notice them.
The main plot could be that of a heartbroken student. They discover that the person they like is in love with someone else. So they have to deal with the pain of seeing their crush with another person every day at school. They might struggle to move on and find themselves constantly comparing themselves to the other person their crush loves.
Well, 'tu pyar hai kisi aur ka' implies that it's a love that is for someone else. In a school love story context, it could be about a person who has feelings for someone else in the school. Maybe it's a story of unrequited love, where the protagonist loves a classmate who doesn't feel the same way. It could also be a story full of jealousy and longing as the person watches their beloved be with others.
Well, without more context, it's difficult to give the full story of'main hoon na'. But if it's the movie, it features Shah Rukh Khan as the lead. His character has to deal with various threats while in the college, and also has to face his past. The movie has some great songs and dance sequences as well. It's a typical Bollywood masala movie with elements of comedy, action, and emotion.
I'm sorry, without more details, it's difficult to tell the full story of'main aisa hi hoon'. It might be a story from a particular culture, a personal narrative, or something else entirely. Maybe it's from a regional literature or a specific community's oral tradition.