DD is almost 18 months and would know over 50 words. She is also stringing together two and three word sentences (where's Daddy gone, bye puppy/marmar etc, Hi nana/papa etc) HOWEVER I know that she is advanced.
I would also say she probably watches too much TV. It is often on in the background for some noise and she will stop for intros and credits then go about her day. Clearly it hasn't affected her learning though!
I also have the same issues with anxiety leaving her. She goes to my mum two days a week when I work and my partner watches her every now and then but I feel so anxious at even the thought of leaving her with her other grandparents or day care. Again - hasn't done her any harm.
None of these things make us bad parents. It make us and our children individuals. You sound like you're doing a great job