Fühlen is often used in context of the condition of a person. "Ich fühle mich gut." Don't say "Ich spüre mich gut" :D Also used in contexts like. "Ich fühle etwas auf meiner Haut" but "Ich spüre etwas auf der Haut" is correct as well. Ich would recommend you to stick with fühlen if you're in doubt what to use :)