I have to say I agree with TC.
Your questions about whether you could be responsible or can you develop a normal relationship are...I'm sorry to say, not normal.
I think non-codependent people don't think those things.
Codependent people that ask those questions, stick around while there are such big red flags (obvious problems), and come on support boards rather than walk away after a month need some help.
I am not saying there is anything wrong with that. I need the help here immensely.
I am just saying you might want to read the book Codependent No More by Melody Beattie and see if any of it fits for you.
may peace come to you.