Definitely. Don't let your perception of yourself as a 'mob highschooler' stop you. Manga has something for everyone. You might discover a manga that helps you escape from the ordinary or gives you a new perspective on life.
Yes, absolutely. Manga offers a wide range of genres and themes. Even if you consider yourself a 'mob highschooler,' there's likely a manga out there that will appeal to you. Maybe it'll be a slice-of-life story that relates to your daily experiences or a fantasy adventure that takes you to a whole new world.