Please help! Need weaning advice

My son, a very determined and stubborn 10.5 month old, is breastfed. I need to wean him ASAP. The only issue is he will not drink from a bottle/cup or any milk. He will drink an oz or two and then be done with it. We’ve been trying since he was 6 months and it’s just not happening. I need ways to sneak the proper amount of formula to him without him drinking it. Every time he latches on I just want to cry. I’m so tired. I wish I never started breastfeeding.