Your hair is similar to mine at your age (I ended up with a transplant at age 47). You are doing the right thing taking notice of it early as opposed to denial.
It may be nothing compared to many, but I feel your pain. Perhaps you could consider stepping up your regime to aim for some minimal gain rather than just maintaining with Finasteride alone? Have a read thru the posts on dermarolling/microneedling if you have not already. At your age, you may just have some potential of gaining some ground.