Don’t be afraid to ask that question, whether you are leading now or you are not yet, ask! If you should lead it is important that you do but if what you are looking at leading is not the right place for you to lead then it is just as important that you do not lead, that you get out of the way and let someone else, someone who is passionate and committed take the lead. A passionless leader is not a leader it is simply someone filling in.
Make sure you do not lead something if the passion is not there, do not try to fill shoes that were not meant for you. But if you have a passion about something, don’t be scared to step out and lead, it is scary, and it does take commitment but if you truly have a passion for it, if you have a desire to see change then you have a responsibility to lead.