There has to be a point in your life when you take care of your own needs. If you're in some sort of a limbo whether it is emotional or situational, how are you to give your attention to others including your kids?
Even if the act seems selfish to you, you've got to exercise some healthy selfishness once in a while. Self care and self improvement are things that you will come back to over and over.
You may want to make a list of the most pressing things you're concerned about those that are minuscule and then arrange them in the order of what you want to tackle on first. Just because something does not appear as important as another thing on your list does not mean that it does not matter to you. Whatever it is you want to do, reconsider what of those things are possible and realistically doable options and try to find ways to work on them. Otherwise, what you feel now may haunt you again years down the road. It is best to start sooner than later or worse- never. Self sacrifice is not a sign of love and taking care of your needs is not a sin.