ok. scince i heard about LDing (about two weeks ago) i’ve had three LDs (all were DILD). I stayed lucid long enough to try flying, walking through walls and materializing things, but everytime after about 1-2 minutes I do something in my dream that results in me moving my real body.
What am i doing wrong? 
Nothing, you’re doing pretty good for starters! Keep going, and the LD’s will become more stable and longer through experience. What you can try to do is some techniques to stabilise the dream, like rubbing hands (my favorite), focussing at details, feeling objects, or spinning (this last one can result in waking up for me, so I dont like it that much). Try some of these and see what they bring you. Good luck 
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ok. I’ll try that
Thank you