I don't know what I'm doing

I invested some money, not a lot, but I want to just close out my account and leave with what I have. I started investing (carefully, nothing risky) just because I know other people my age do this. But I really don't know how to handle it and don't want to screw up. I tried learning but it isn't for me.

I'm looking for advice on how to stop my investments and close my account. Am I suppose to sell these stocks first? I'm genuinely too confused on these things.