We all make mistakes on every flight. Anyone who thinks they are perfect, is kidding themselves and I'd rather not have to fly anywhere near them.
To me the "right" attitude allows the ability to debrief yourself properly and work on any problems you may have found. I fly everyday and have done for a number of years, it doesn't however mean that I don't stuff things up from time to time.
Well done for realising your mistakes and having the gumption to want to work on them.
Capacity is the first thing to go when you are rusty and what you have described, is nothing more than that. The key with making sure that these mistakes don't happen is practice and to try and find ways of making a flight "flow".
You've made mistakes this time that you probably won't make for quite a while.
We're only human afterall, so mistakes are a given!