I understand how you're feeling. I felt similar my freshman year. My first year of college was actually pretty awful. In addition to it being a big move (I went to school far away from home), it was just a rough transition in general - taking on harder material, having to meet new people, etc. It's only been a little while. It's normal to feel a little bit lost. It sucks, but my best advice is to give it some time.

Also - while it may seem like everyone knows what they want to do, I can pretty much guarantee you that isn't true. I had a lot of friends who were adamant that they were going to go to medical school, or they were going to vet school, or whatever. Do you know how many actually ended up continuing down that route? Like one. Almost all of them changed their majors at least once, and some even switched to an entirely different discipline (i.e. STEM to liberal arts). This time in your college career is time when you have the flexibility to try stuff out - see what you like, what you don't like. I went into college in love with biology. I took the first class of the general bio series at my university and hated it.

I know that it can be stressful to feel like you are the only one who doesn't have your life figured out. But you're not the only one who feels that way. As for picking a major for which you already have skills/knowledge, what would be the point of going to school if that were the case? College is the time when you can try new things, as I said. You're going to be one who completes all of the work. You might as well spend that effort and time doing something you enjoy. Any diploma you earn is going to require hard work, regardless of how much previous knowledge you bring to the table.