It seems to be you are a in a kind of circle. If you want things to change the only way is to change.
That you don’t believe in yourself and feel down is coming from your thoughts that you realize that you procrastinate and only wait. If you wait you will wait forever. Nothing in life is difficult, everything is only steps, each goal is a combination of steps that have to be done one by one. If one fails you retry and if again fail you change and correct and retry and if still fails you step back and rethink if works this way or look for advice and retry a new way but as world is moving you keep moving and doing. Sometimes even acting without good result is better than nothing because later it shows you what didn’t work and so you find the way how to solve it. I think procrastinating is something you learned in life. Small children don’t procrastinate they jump up and do whatever they want to do and feel happy when trying. When someone procrastinate it has to do with the believe system. Mostly people think it does not make a difference if they do it or don’t do it or do it later. And there is a fear if they do it if it would be good or they look for the perfect solution to do the task. Another issue can be that you are with persons or a partner that bring you down or don’t help your self esteem and unconsciously you procrastinate to punish them for how they treat you, but this work in the wrong way.
You can think about all hidden issues that hold you back or you leave them aside and start changing. Start with small steps. Each day a new task and do it. If one day you don’t do it, still be kind to yourself and accept that you where doing long time differently so it needs time. You need to feel good when finishing a task and when done give yourself good emotions. Also before you sleep imagine how you do the task you want to do next day and how you feel good doing so. Also imagine how your life gets each day better and better and how you feel each. Day stronger. This is called visualization of the future you desire. Fake it till you make it.
One important issue, look if people around you support you or perhaps they like to have you in this position without they are realizing so—perhaps they feel better when they feel more productive than you. This does not have to be the case but it is possible.