Oh dear, I think its one of those things where you have to find the right balance. Afaik, air needs some humidity to it, but rooms should not be outright damp. But thats easy to check, just look for damp spots on walls.
If you are worried, you can get a small electronic device like this. They are only about a tenner. We actually got rid of our grobag egg for one like this. The reason we got one is because DS went into a room that is mostly basement and we were worried about whether we have a damp issue there (we do but only slightly and it's getting rectified by the homebuilder, thank goodness!). In the research we did (and advice given by professionals), you want a humidity level of around 40-60%. Anything over 70% is considered too humid. IMO, around 75% is when it gets unbearable for me. TBH, you seldom get that unless it's really wet weather during summer and you have a room with damp issues in the first place. A cheaper solution for you could be to get a humidifier and put it on when you have clothes drying, it will help your clothes dry faster and some dehumidifiers have an auto setting so it turns itself off when your room gets to a set humidity level.