Ghost Philosophy
30 year old dateless virgin
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This is a South Asian genetic PCA plot, with a focus on specifically Indians, Sri Lankans and Bengalis. You appear here on the basis of DNA.
If you look at the picture, you will notice that Bengalis are pulled away from other Indians (especially Dravidians, since Gujaratis and Punjabis are North Indians) and Sri Lankans. This is because they have significant East Asian admixture from a Tibetan source that Indians (both South Indians and North Indians) and Sri Lankans lack.
In other words, the only reason that Bengalis aren't clustering with Indians and Sri Lankans is because they have East Asian DNA. If it weren't for that admixture, they'd cluster exactly with Indians and Sri Lankans.