Whatever faults you may perceive in yourself, acknowlege them and resolve to change for the better. Age, in Islam, is a good thing. With it should come maturity, knowledge and wisdom. Take the knowledge of your bad experiences and use it to avoid other possible bad situations. Get involved in a nearby Muslim community.
Sisters often have study groups.
Get involved in things that will help improve you spiritually and make your daily life more pleasant. Begin to practice your religion wholeheartedly. Now is the time to concentrate on yourself and your children. Any improvements you make will be a good influence on the children. If you are cheerful they will be cheerful.