What is your advice for me, as I fear that I will not be able to control my desires after marriage, and that Satan will overcome me, leading me to engage in anal sex with my wife? And is it permissible for me to engage in anal sex with her from behind clothes?

Anal intercourse with one's wife is strictly forbidden. Whoever commits it has disbelieved in what was revealed to Muhammad, and is accursed. Do not treat your fears of marriage with another wrong; rather, embrace marriage, for it is the best remedy. Occupy yourself with what benefits you in your religion and your worldly life. Increase your remembrance of Allah and your obedience to Him, lower your gaze from the forbidden, and keep your limbs from sins. It is obligatory to avoid anal intercourse with one's wife, even from behind clothing, for whoever grazes around the preserve is likely to graze within it. One should distance themselves from forbidden acts and place a barrier between themselves and them.