You forget I am rather ancient and pizza, garlicky tomato sauce and Asian foods were not something that a working class Southern British kid from the suburbs would have eaten in the 50's and 60's. Pizza places as such did not exist and there was no pizza on sale in any shop, nor any ready made pasta sauces. The only pasta I knew of was macaroni (for puddings) and tins of Heinz spaghetti. No doubt there were Italian restaurants in cities and particularly London which would have used garlic and maybe served pizza and as you say, there were Asian restaurants. But my family never went to restaurants to eat in any case.
Probably the first garlic I had was when I first went to an Indian restaurant for a curry after I left home at 18.