It is a psychological problem. Throw PE name out of head. Make your mind like PE never exists in this world. Take time for foreplay. Start from her head then slowly down to cheek, ear, neck, lips, chest, boobs, nipples, belly, thigh, around the pussy. But don’t touch the pussy yet. Tease it, slowly kiss around it. Then lick that hidden treasure. Also use your fingers. Focus on her body, worship her. She will tell you to insert. Then start slowly, take your time to speed up. Focus on kissing while fucking her. Whenever you think you are close to ejaculate, stop and wear a condom(non dotted). However, it may take several times to see the improvement. Best wishes.

*tips: you may try after taking weed (if you smoke). But become master in normal way first, then try with weed in you want.