Advice and encouragement needed

It’s been 3 years since I had a consistent gym routine. I’ve lost most of the gains I made in my 20s and I’m turning 33 this year. I need to get to grips with my fitness now so I can be healthy as I age. Does anyone have any tips to help me MENTALLY in the gym. Any mantras or facts I can think about whilst trying to start from what feels like rock bottom with my gym confidence. I really want to feel powerful and confident in my body again. I’m female and don’t want kids so I have the opportunity to really turn this around.

UPDATE: day one done, the hardest part getting back after a long time away. Enjoyed my workout and feel inspired and motivated by all the responses. I scaled it back for the exercises that are intimidating (Bulgarian splits) for 2 sets rather than more for now and I ended up doing 3 anyway. It took the pressure off and I’m on my way to Gainsville 🔥 Thanks everyone!