Is "it's a lot" same meaning with "it's hard"?
Yes, in this context, "a lot" is similar to "hard" or "difficult". "A lot" in this song lyric is referring to to the problems of life and love being a lot to deal with, which is the same thing as being "hard" or "difficult". Here's a few examples of "a lot" in similar contexts: Ex: Raising kids as a single parent is a lot. Ex: I don't know how to deal with all this stress, it's a lot.
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