hello, yes you can go for orthodontic treatment with tooth repositioners.. lots of options are available inthem and they are ideal for 12yr/mixed dentition stage.. this will ease out your pain.. if the pain is due to traumatic occlusion...
you should consult an orthodontist , he will take few radiographs( lat ceph /OPG) and impression to assess your exact clinical status and possiblity of type of malocclusion
and its causes whether dental or skeletal..
If proper treatment is given then the malocclusion doesnt arise at all as tooth will be reposition at exact /guided place as soon as it erupts..
serial extraction can be considered in few cases.. dont worry at all..
maintain your oral hygiene
by use of dental floss,anti-septic mouthwashes and brush twice daily as the gum problem and caries mostly causes pain in crowded dentition..
you will soon have a healthy and perfect smile.. take care.