17yo was born w/ hips or thighs turned in&never did anything about it. Pains in hips, thighs, feet, thighs snap&can't sit feet crossed. How do I fix this?

Physical therapy. Physical therapy is your first line treatment. I'm not talking about 1 or 2 sessions, but 2-3 months of routine (3x/week) therapy. If that fails to improve the situation, then see orthopedic surgeon about what other interventions, including surgery, may be indicated.