I think what you are doing is wonderful. Making a positive choice for yourself in respect of the family you want. I see no failure at all; and I think the failure would be in knowing you’d like a family and not having the courage - in the absence of a partner - to go out on your own and do what you are now doing.
I know several lone / single mums who have used a sperm donor and have raised really beautiful children and within their loving and kind family.
Families come in all shapes and sizes. You won’t be lumbered with the difficulties which arise following any breakup, be able to self determine the living location for your family, nor have any resentment from a lump of a useless partner, were you to end up with one and have to compromise and negotiate with them the next 18-25 years of your life.
I have an Ex-H who is entirely unable to parent, he says he can’t look after our 2 on his own - and refuses to be in my DC’s presence without my assistance. I am effectively a single parent but still having to negotiate with him.
Be prepared for a tough and relentless first 4-5 years as your DC moves from newborn to little person; you won’t get any break on your own, unless you have supportive friends / family or pay for assistance. I am told it gets easier after this.
Warmest wishes for a positive outcome with your fertility treatment in the coming weeks and months 