What does the phrase
I'm really into it.
I think it means the same thing as "I really like it." Is that correct? Why not just say that? Is there a difference in meaning?
The phrase "I'm really into it" means that the speaker is very interested in the subject or activity he or she is talking about. Here's an example.
I have been playing football for ten years. I am really into it.
I am watching a film about World War II. I am really into it.
Also, you haven't provided any context in your question so there is a possibility the phrase could mean something else in your case.
Be into also, get into:
Be interested in or involved with:
- For example, She's really into yoga, or Once you retire, it's important to get into some hobby you've always wanted to try. ( mid-1900s)