I left my ex as he did not want the same things I wanted (children/ marriage etc...) his excuse was he was a selfish person.
I didn't think it would be fair for me to wait and hope he might change his mind ( I had already given him an extra year as he indicated it might change) and it would have been wrong of me to accidently fall pregnant. It ended fairly amicably.
Luckliy I' fairly confident and thought well his loss is someone elses gain.
Lacking in confidence makes it difficult to get out there and meet new people, not to mention how hard it is being single after a long term relationship.The more people you meet, the higher the chances of meeting someone who you are compatable with. You will also find as you and the people around you grow older thier priorities change.
You seem to acknowledge that child rearing is not a walk in the park, you have the desire and determination. You are making constructive moves by asking questions, though the answers might not be what you want to hear. Do your research, find out your options, don't forget adoption (though as pricey as IVF) and get your cycles checked out.
Good luck