It's great you are self-aware of some reasons why you find it hard to take advice. I guess my reply to that would be though, "Then how will you take advice from a partner in a relationship? And how will you be able to make some changes there when compromise is needed and when she wants something that is not a part of your routine?"
So, my recommendations:
(1) Incorporate the advice into your own routine so the change does not seem so drastic, and do it in a smaller, step by step way.
(2) Think of the advice as your own or rephrase it in your own words to make it more your own, and think of failing as not failing but "Learning". In order to grow, we all need to sometimes make mistakes, face rejections and critiques and to attempt new things. That is what learning, gaining strength and growth is all about.
(3) For many of the advice given you need not hours of efforts daily targeted there, but minutes and you need not advertise your efforts to any naysayers in your life either. And anyways, when they are negative to you or stand in your way, see that as an opportunity to head off into another room to focus on attempting some of that other positive advice, or think of it as an opportunity to show your strength more there, and to either find some way to spin their negative message to something good, or to divert your mind away from that to something unrelated and more positive.
So, in general, yes, I agree those with rigid routines and with more rigid negative mindsets may think it is harder to take advice, for one or more of many different reasons, but most here seem to be just requesting for you to give a few to several minutes a day doing something more positive and for you to take things step by step and to be open minded that if you want things to get better, you should seriously consider others' opinions and prioritize there, and to take some risk by changing some routines up some, as otherwise time may be keep slipping by, distancing yourself from your stated goals.
