It depends on what kind of tomatoes you planted they may just grow to that size and some are cherry, roma, beefsteak and who knows which one you planted?
Some tomatoes just grow to certain sizes. Unfortunately, tags and seeds get mixed up, so you cannot always rely on what it says you are buying. Rather than getting upset, just eat and enjoy them - there have been years when I'd have been glad to get any tomatoes at all. Even is you have a larger variety, poor soil, extreme temperatures, lack of water, and insect problems can stress plants causing fruit will ripen before growing to the proper size. Still, be glad to get fruit.
That sounds perfectly normal. Don't compare your homegrown stuff to the GMO's you see in the grocery store!
Unless it's a Beefsteak variety that's supposed to be very large, that sounds about right to me! If it's been a good season and the plants have been taken care of (and if they've produced a lot of fruit they probably have) then it's most likely just the size of the variety you're growing. I've had tomatoes fail to get very big in bad conditions, but they were usually pretty small and didn't ripen.
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