What's wrong with my bicycle?

either your wheel is buckkled or it is not screwed on properly, try taking it off and pull back the tire... ALSO lift up the back tire and then peddle while its in the air, if it goes left to right its buckkled n you may need a new tire depending on how bad it is.
 
When I pedal the back wheel tilts and then pushes against the fram making it impossible to pedal. But when I push the bike it doesnt happen
 
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