Student or Learner
I'm unsure whether this sentence is correct.Could you help me?
I'd like to be majoring in chemistry'
If you currently major in something else, but wish you were majoring in chemistry, it's okay.
If you don't have a major yet, then "I'd like to major in chemistry" is a better choice.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.