Three area's a Personal Trainer will help you get better with:
Prioritising your time and consistency is key. There are 168 hours in a week. Prioritise at least 1% (<2 hours) per week to working out should be a critical part of your week. That could be broken down to 3 sessions of 40 minutes each. By having a personal trainer, they will hold you accountability to working out on a consistent basis.
The personal trainer will encourage you to be patient with yourself. Don’t expect miracles or dramatic changes overnight! There is an expression that "It takes 4 weeks for you to see your body changing, 8 weeks for your friends and family, and 12 weeks for the rest of the world to notice." Stick at it and the results will come in time.
Don't compare yourself with anyone else. With today’s social media it is too easy to think you have to look like someone else. Just compare yourself with how you were yesterday, last week, last month, last year. Are you feeling better, fitter, stronger than you did before?
By spending at least 1% of your time working out, and being patient with yourself, and being kind to yourself by only comparing yourself to how you were yesterday, you will be better than you were previously. A personal trainer will support you to do this consistently, the results will show and you will feel much better.