Dude,my first PRACTICE with my first BAND was really having FUN with my first musically inclined FRIENDS.

Dont feel obligation of any kind until your playing within a true band...
A true band includes FUN,FRIENDS,PRACTICE,RESPONSIBILITY and lastly MUSIC.Why music last?Because a BAND can't form music until the many pre-requisites are met...until they are,you are JAMMING and jamming around with different people will lead to those many pre-requisites of a band.

So in conclusion...KEEP JAMMING!