8 month old will not eat baby food

I have tried all I know to try. He will eat oatmeal mixed with his formula and that’s it. He hates anything with a strong taste and that’s all baby food. I’ve tried every kind at the store and he hates all of it. He shuts his mouth and won’t open it back up after the first bite!! Please help I don’t know what to do! I’ve tried pouring it out on his plate so he could play with it and stick his fingers in his mouth but no such luck. I have no clue what to do and I feel so horrible because I know he was supposed to start eating months ago!!