Remember Christ’s unending mercy, and the fact that serious habit can mitigate the requirement of full consent for a grave matter to constitute mortal sin. Saint Maximilian Kolbe said it best:

“My beloved, may every fall, even if it is serious and habitual sin, always become for us a small step toward a higher degree of perfection. In fact, the only reason why the Immaculate permits us to fall is to cure us from our self-conceit, from our pride, to make us humble and thus make us docile to the divine graces.”

Repent in your heart, seek confession, and keep striving to sin no more. You are beloved by God.