50-70k salary in manhattan, am I cooked?

I'm in the final stages of interviewing for a job that would pay 50-70k (probably on the lower side bc I'm a new grad) with no overtime but someone flexible hours, i.e. I may have to stay late some days but will take the time off other days. My sister lived in New York on 100k salary and she said that was barely comfortable in terms of rent and recommended I start looking for a second job to pay rent. At the same time, she always ate out, had an equinox membership, and took a ton of trips in that same year. Am I actually cooked in terms of Manhattan housing or is my sister just boujee?

Edit: If someone else is coming to this post looking for advice, the best I've seen is if you're female student/intern/early career, look into all-female boarding houses (the webster, st. mary's residence), they're so much cheaper than anything else I've found (st. mary's is 1188 a month!!)