What to do about small breasts? (or none at all)

Im 16 and around this time it should be normal for my age to have at least a decent sized chest but all the girls in my year group are way bigger than me and its really a downer that i cant fill out or wear more grown up things when i cant even fill out even a training bra.
I have the height and body of a teen but the chest of a 7 year old and it just doesnt work out.
I currently wear a padded bra in the smallest size there is to make it seem like theres something there but apart from that im a brick wall :(

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