I often fantasize about some love scenes. Is there a problem with that?

I often fantasize about love scenes, people in my life, and people in my virtual imagination.(Most of the time, I would feel especially sad and give up thinking about the people in my imagination and real life.) When I reached the point where I had to fantasize every moment, just like a romance novel, I would constantly make up the plot. When I was particularly emotional and moved, I would hide in the quilt and sleep all day long. I would often cry emotionally. I felt very comfortable like this. I had already completely relied on them. I could not give up this kind of behavior. Was there a problem with this? Should I restrain myself from thinking about what harm it will do to me? Also, I'm 17 years old. Although I've had many ignorant experiences and online relationships, I've never been in a formal relationship. Is this happening because I'm too eager to be in love? What should he do? Also, I want to ask if anyone else has such a fantasy? Especially girls. Also, my fantasies are all about how infatuated boys do things for girls. This is also related to my experience. It's always the boys who like me first, do something touching for me, and even fight for my love.(When I first saw them like this, I just thought it was fun and my heart was sweet. Later on, when I saw them sad, I was especially happy. It was no longer the kind of feeling lucky.) Some people even called me a heartthrob and a playboy. In fact, I didn't think of myself that way at first. On the contrary, I had always been a very ordinary girl with low self-esteem. I thought that others were better than me, but I didn't know when vanity took over my heart. Slowly, I developed a narcissistic mentality as if I was an expert in love. I also began to pay attention to my appearance and looked at myself in the mirror whenever I had time. (I never cared about my appearance in the past.) Now, many people have inexplicably fallen in love with me because they are good to me. I don't even know if I like myself or them. This has affected my life. I can't treat the opposite sex with a normal attitude. I will inadvertently please others. If he shows interest in me, I will be more inflated. If he shows no interest, I will be very disappointed. I have been trying to adjust myself. It's much better. But I feel that my desire for love has reached the point of hunger and thirst. I don't know why I'm like this. I just feel especially envious when I see some lovers 'stories on the Internet. Naturally, I have a lot less energy in my studies. I still have a very important exam this year. What should I do? I'm sorry for asking so many questions unknowingly. It has troubled me for a long time. I feel much better after saying it. Please help me and point me out. I really thank you!