Try to focus on real-life relationships and social activities. Meeting new people and building connections in the real world can help shift your attention away from the fictional crush.
Remember that the fictional character is not real and has no real connection to your life. Think about the qualities you like in them and try to find those in real people around you. Also, give yourself time and don't be too hard on yourself for having the crush in the first place.
Limit your interactions with your teacher outside of class. The less you see them in non - academic settings, the easier it will be to get over the crush. For example, don't stay after class for no reason.
To get your manga published, start by building a strong online presence and sharing your work on platforms like social media to gain a following. Next, look for publishers that match your style and genre. Prepare a professional pitch package that includes samples of your work, a synopsis, and your artistic vision.