Give up or stick it out?

When should you give up or stick it out?  What if it is better for someone for you to just back out?  What if it is better for you?  What if it isn't?  What if sticking it out could be the most beautiful thing?  I feel like I am at a crossroads right now trying to figure everything out.  It may be wonderful and beautiful, but there may be a lot of heartache along the way.  Is that worth it?  I don't want to cause any more pain or heartache for others and that is what I feel like I am doing.  I am making it hard for others and I can't do that.  I am not strong enough to cause people pain, even if it is unintentional.