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From personal experience I recommend that you start to fix it, yesterday. No messing around.
I played right handed sports for ~17 years before it caught up to me, but it did. (Volleyball, badminton, and softball.) The result was that the right side of my back got so strong that it pulled the whole thing into spasm, repeatedly; took months to be able to sit in a chair again without severe discomfort. I’ve had to temporarily given up most of my sports and stick to balanced activities.
For your reference: