I feel like a lot has happened in your life in a short amount of time. A new job, new horse, etc. That's extremely stressful.
Stress can definitely make all of this seem more like a task you HAVE to other rather than something fun in your life.
I would definitely just try to figure out a schedule that works for you that doesn't make you feel rushed but gives you enough time to do everything.
Also, set some goals for you and your horse. Setting up goals is a great thing to get you going and make you want to try harder.
Don't set the bar too high with crazy goals such as jumping 3' right away.
You need to work your way up as you go. You and your horse will learn more about each other and challenge each other as you go.
Set small goals such as keeping your heels down the whole ride and keeping a collected, good trot as you go around the arena.
Don't be too hard on yourself. Change is tough. You'll be fine.