RJG86

My key to my lexus wont go in all the way when trying to put it into my ignition, it only goes half way. I cant start my car because of this! What is wrong? could I fix it myself. Thanks! P.s- I know nothing is blocking the key because I manage to get the key in after "trying". (got a blister, and sore wrist). But after i take it out the same problem trying to put it in again.