This is a long-winded question, but from what I can tell, you're asking who you should run a character that doesn't click with you, so I'm going to answer that question for now. (Please correct me if I'm wrong, by the way)
The first piece of advice I can give when it comes to D&D is this: Always ask your DM first, unless it is something that they can't know. (i.e., a surprise)
After that, when it comes to running a character, you typically want to do someone different from you, but not by too much, unless you are willing to commit to it. Try to figure out what you like to do, and who you could be if something in your past had been different, then change it to suit the character you are making. While yes, you should step out of your comfort zone, I also think you shouldn't throw yourself into the deep end unless you know you can swim.
And the most important thing to remember is that this is your character, and, in the end, you have final say over who they are and what they do. You don't have to do anything that others suggest you do, and you don't have to do what you had originally planned either. If you are having fun, then that's (almost) all that matters. Just don't become a murderhobo. (And make sure that your DM is okay with changing your character if you make a major change to them)
I hope this helps, and have fun!
