Shifter problem

I have a 2020 mustang gt with 11k miles when I bought it I noticed the shifter had a lot of play when I got to turn the car on I shifted into first gear or so I thought but it was third even tho I’m pushing the shifter to the left really hard it still goes into to third only way I can get it into first is by picking up the reverse lock out do you guys know what it might be ???