My body is too weak for judo?

Perhaps I should give up? I am a 40 year old Indian man who started judo few months ago as I was suffering racism in Wales, Great Britain. But the gentlemens who I practice with throw me too hard. I had to stop as I keep getting pains. My health is also not very good as I never did go gym and my diet has alway... show more Perhaps I should give up?
I am a 40 year old Indian man who started judo few months ago as I was suffering racism in Wales, Great Britain.
But the gentlemens who I practice with throw me too hard.

I had to stop as I keep getting pains. My health is also not very good as I never did go gym and my diet has alway been poor.
But I keep trying but it is very much a struggle.
How do you get a strong body to get thrown on mats?
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