I’m sorry you’re feeling such distress, Moneyboss. Whatever other people’s thoughts on cost etc are, these are your feelings and they deserve to be acknowledged. 
I’ve been to far too many funerals in recent years and it’s odd how each has its own ‘vibe’. The one for my sister was upsetting and sad yet it also had a tinge of humour and a memory of her because I could see her fingerprints all over the planning, which was comforting. On the other hand, there have been some funerals I didn’t attend, of people more on the periphery of my life and where it felt like an intrusion into a family’s grief, so I didn’t go.
Perhaps you could hold more of a celebration of your mother’s life in the Spring, to remember something particular about her - say a love of gardening so you could have a garden party - and invite people.
Remember, too, that a direct cremation has been the deceased person’s choice but that doesn’t mean you have to forget all about that person as if they never existed.
Take care.