I think you need to develop a new mantra to get yourself through this: what I wants matters.
What anyone else thinks, whether they approve, disapprove or are merely downright curious, is not your problem. You don't have to explain, discuss or even inform. "I had my reasons" is all the explanation you to have to give. Anyone with a modicum of life experience and empathy will understand, and if they don't that;s a reason to not keep them too closely involved in your life as you go through this.
You sound as though you've spent the whole of your life worrying about other people's needs. You are probably a coper, someone who is capable and often organises the lives of those around her. Believe me, without someone (i.e. your H) sapping that energy from you (marriage is suppose d to be a partnership, not another parent-child relationship), you will not only cope with this breakup but you will positively soar once it's behind you.
Practically speaking, unless you are going to be taking debts away with you (even that's not insurmountable), you will be fine financially. Despite the coalition's best intentions, there is still a benefits safety net for women in your situation, whether you will be a SAHM or whether you are working. Try the entitled to website to see what help you'll get.
Hope you get through this ok.