How do I get other people to be comfortable around my 17 year-old daughter's underarm hair? She doesn't shave it.

Other people prob?? People have whatever social expectations they grow up with & learn to accept. That your 17yo chooses to "go european" is her issue & the peer pressure she feels with this or any other choice about personal hygiene or grooming is her business.As a mom/dad you should not feel compelled to make excuses for her at this age or try to convert your acquaintances on the issue.