I will do cross leg orgasm by crossing legs applying pressure on vagina multiple tiimes a day from age 6 is it causes sexual asphyxia or not?

No. Sexual asphyxia is the result of people using ropes or other restraining devices that compress the neck.
No, not the same. Erotic asphyxiation or breath control play is the intentional restriction of oxygen to the brain for sexual arousal. The sexual practice is variously called asphyxiophilia, autoerotic asphyxia, hypoxyphilia. This often involves strangulation or choking in an attempt to induce mild cerebral hypoxia during sexual activity but accidental deaths can occur.

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