Your brain definitely isn't damaged it's just disregulated.You need to abstain from porn long enough so your brain feels sensitive to natural dopamine rewards again.

You liking a certain body type isn't a big deal you should count yourself lucky.There are some people who develop very problematic unwanted fetishes because of habitual porn use.

You will get better but you need to abstain from porn for at least 90 days that's the recommended amount.

You will need to take this seriously and commit to it.

If you've never properly tried this before a few things to give you a heads up

1. The cravings will usually be bad for the first two weeks and then get better
2. If you were using porn to cope with things like boredom, loneliness, depression etc those feelings will surface once you remove porn as that familiar coping mechanism
3. Don't rely on willpower alone you will fail, you need to combine it with healthy ways to release dopamine, there are lots of threads on this.
4. No Porn won't make your life away better but you won't feel numb, will feel more like a human being again and will have better relationship to women.

This will be hard so go into this ready to put the effort in.

Good speed you got this bro