Okay, so, I just turned 20 years old & I've lived in

>>1059505
Why those cities in particular? Usually my bucket list involves some sort of activity. Lately I'm into hiking and enjoy traveling for the outdoors more than the cities so currently I really want to see some national parks and world heritage sites that emphasize nature.

Copenhagen is my favorite city in your list. I haven't been to Tel Aviv though. I will someday but I don't think it's my type of place.

However, while Copenhagen can be a nice start, don't simply project your whole traveler ambition on one single city. For example, why not visiting Denmark in general, take a cruise to Oslo, or another Scandinavian destination?
If I were you, I'd do that, start from Copenhagen and go all up north, to Tromso, for example. There are many ideas to be made. Be creative, I mean, if you come from the US, you wouldn't want to stay in Europe for only 4 days.

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Copenhagen is nice. If you can, try to see Helsingör too for Kronborg Slot (also known as Elsinore Castle). If you feel like visiting Sweden then Helsingborg is just 20 minutes away by ferry from Helsingör.

From Kastrup airport you can take the train all the way to Gothenburg, as it makes stops in the bigger cities along the coast.

>>1059505
I live in Helsinki as a student, the winters are hard here. It's an alright place to live but not that exciting. It's mix of Stockholm and S:T Petersburg but much smaller, people speak somewhat good English

It's shit that the sun is only up a few hours a day in the winter, often I don't see the sun for several days

Come in the summer is my advice

Or go somewhere cheaper and more exciting