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The question has often been asked; Is Buddhism a religion or a philosophy? It does not matter what you call it. Buddhism remains what it is whatever label you may put on it. The label is immaterial. Even the label 'Buddhism' which we give to the teachings of the Buddha is of little importance. The name one gives is inessential..

That wounded child, indeed, is also our body, not just our brain.

The wounds of the past live in our muscles and bones as much as our 'grey matter'.

Still curled up inside us waiting for care.

One of the major insights that I've had since starting to learn about buddhism is that concepts like "deserve" are not very useful. Nobody "deserves" anything. Seems like you said it right. You're 30 and still laboring under the childish belief that the world owes you something. I don't say this derogatorily. If you meditate, and try to follow the 8-fold path I imagine your perception of your situation will change. If you can start to understand concept of dependent arising and the cause and effect nature of reality, you can start to reduce your suffering. Consider dominoes. They don't fall over because it's what they deserve, they fall over because they were struck by another domino. Hope this is helpful. I think I've been in a similar mental space to where you appear to be. One thing I can assure you is that if you bring notions of entitlement and "deserving" to a relationship, you're going to have a bad time. Good luck on your journey.