I was starting to wonder if anyone was going to respond to me.
ーI was worried no one would get back to me.
「誰も私に返事してくれないんじゃないかと心配した」
to get back to ... で「…に返事をする・折り返し連絡をする」
ーI was starting to wonder if anyone was going to respond to me.
「誰か私に返事をしてくれるのかと思い始めてました」
I was starting to wonder if ... で「…かと思い始めた」
to respond で「返事をする・答える」
ご参考まで!