I live in Suffolk and you can get a direct line that doesn't stop at all. I think it's the Huntington train that is direct. It takes a bit less than an hour. Even if you take the Ronkonkoma line it's a just bit over an hour. It takes the same amount of time to drive there!I live in Sufflok and I drove up there one time. I'm not saying three hours per ride three hours for the whole day there....
Maybe you are too young to live there- you will have plenty of time to experience city life! Don't rush it!