When you are on the right path, you feel it. Your motivation must be checked only by reality, and your mental and physical limits- which you will likely stretch. Criticism falls off you like water off a duck’s back, and you likely will be very alone in your clarity at times. Be confident that you are on the right path, if it feels so.
Conversely, if you are not on the right path, or slightly off, you will also feel that- by way of lack of motivation, lack of clarity, lack of interest in what you are doing. You may just need a rest, but if this feeling remains, then you should reconsider the path that you have chosen up to now. You may need a course correction, or even a reboot.