No worries. as the German proverb goes, "In the beginning everything is hard".
In other words, give it some time and it will get easier. It takes time for callouses to form on your fingertips and it takes time for your muscles to learn how to work together to get your fingers into the correct positions.
You are definitely on the right path as you are actually doing something about it! Hence, no worries... it will come and that sooner rather than later! It all adds up, especially when we practice more or less regularly without too much time off.
At our SUPA song circle it is evident whether our members have been playing on the side or simply waiting for the next song circle. those who play on the side (ie practice) get better and better sooner. Those who simply play once a month show little or no improvement. they are either OK with this, or they don't get it - that practice will make things easier and better.
So take heart!
keep uke'in',