1. to feel something
2. to feel ("sich fühlen" - in the sense of how you feel emotionally or physically. If you want to say that you feel like doing something then "Lust haben" or "Bock haben" are more idiomatic)
3. to feel like ("sich fühlen wie" - in the context of comparisons)
4. to feel like ("sich fühlen nach" - in the sense of wanting or desiring)