No problem! There are many options, but here is one you might not have seen, unless you have friend already with a tiny bathroom. It’s a corner shower. These are a great solution for that guest bathroom that isn’t as large as you’d like it to be!
There other solutions as well; tucking a shower under a sloping roof, and installing the shower head on the full height wall allows you to install a shower in an otherwise unused space. The shower door can be cut at a slant to fit the roof slope.
It’s a challenge to build a full bath into a small, awkwardly shaped space, but it can be done!