@Captain24 learning to recognise the inner-critic, or inner-saboteur if you like, can be tricky. I think what's helped me a lot is learning how to 'dialogue' with those inner parts of me that want to be critical or harsh. But first you gotta learn to recognise it, and recognise that it's not malicious, just unhelpful. Another thing I found helpful was to try to figure out whose voice it actually is.
What I mean by that is like... quite often our inner-critic is just echoing things we heard when we were young. So it might be my father's words/approach, but I hear them in 'my' voice in my head so they feel like 'my' thoughts - even though it's actually just something I absorbed as a kid.
So for me, first step was learning to notice my inner-critic without condemning it. We might hate how our inner-critic treats us, but it is still part of us - and so just as deserving of compassion and understanding. Like being able to see that my inner-critic just wants what it thinks is best for me, regardless of how I get there. Second part for me was learning to take what my inner-critic said with a grain of salt. That could be as simple as 'nah don't need that right now' or could be like 'I think this is my father's voice, and doesn't really reflect my true values'. Then third part was starting up that dialogue, in the form of gently challenging and reframing what my inner-critic had to say.
It's okay if that feels pretty overwhelming right now! And your process may look different too, as you find what works for you! But we start small yeah? Baby steps, like you mentioned not really knowing when it's your inner-critic vs. self-motivation. So maybe for now it's just about learning to recognise it, or reflecting on where it's come from, without necessarily feeling like you have to change anything just yet. Cos that's how we end up putting pressure on ourselves, and if we set too high a goal and don't reach it - well that's just fuel to the inner-critic's fire, innit?!
And yeah! Just like the resin, we trial and error our way through it all. I think one of the most common things our inner-critics like to focus on is making mistakes. But mistakes are essential for growth!! Or as Bob Ross would say - there are no mistakes, just happy little accidents!