I don't really like any of my classes, and I think I'd rather study astrophysics or astronomy. Is it possible to switch still?

You should talk to the B.tech academic advisers. They will be able to tell you if the switch is possible. You can also try talking to the Associate Dean's Office in BSB; they might be able to help you though I'm not sure what faculty B.tech falls under.

Good Luck!

B.Tech is under engineering. If you do switch it is to late to change courses now so you would have to start second semester. Try your best in the B.Tech courses and maybe your mind will change by the end of the term!

If you think you are really unhappy definitely talk to the academic advisor for the faculty you are interested in switching to, although like people said it is too late for this semester. My personal advice for you would be wait it out and see since you can't switch this semester anyway. Give your classes more of a chance, after all it is only the third week! If you are still really unhappy after that, look into switching but don't rush it just yet! Best of luck