You definitely don’t need to sing or play fingerstyle to play guitar. 
In most bands / live concert, there is the singer (who may play guitar or not), but there is also another guitarist or two who play. Most records involve more than one guitar.
Start with the app, it has cool backing tracks just like if you were the guitarist in a band. And after 1 year or two, you may move to making your own backing track with software like Moise which remove the guitar from a band track so you can add yours. You can see how it can be fun here in grade 3 Math07 JG Rock Songbook Project (10 out of 15) - 3 songs added 3 June