Im in America and she is in Sweden, i really like her but idk how i would ask her and how to make her see long distance isn't impossible if she doesn't already. What do I do? Is it a "more fish" situation

You're right, long distance isn't impossible, in fact, I have a few friends that have been in stable, committed, long-term relationships with others that live hundreds of miles away. It's definitely possible.

Why doesn't she think a long distance relationship isn't possible? What's holding her back?

I'm in a long distance relationship for over 1 year and in half now. Yes, it's really hard and sometimes you over think of bad circumstances could happen. But if you really love a person even distance is not a hindrance for love knows no distance.

I'll tell you that LDR is possible, you just need to give effort every day to your relationship. Every day is a challenge to stay strong and stay in love together. You also need a huge amount of trust, patience, and communication.

If someone is reading this that are in a LDR. My only advice for you is ever you are over thinking too much, you need to drop it. Don't ever accuse your partner-- like he is cheating,  when you don't have any evidence. Instead of quarreling, show her how much you love, support and appreciate her. Trust her so much, it will make her feel guilty to cheat on you. But don't forget to trust yourself too.

We thought that the most challenge part of LDR is distance. But no, the most challenging part is yourselves. The distance will not try to break you apart, but your doubts will.