Completely normal. Take a deep breathe and relax
Your fish will be ok... It's gonna need a little time. Whenever I introduce a new fish I do it with the lights off and then cover the tank with a towel. Give it cover of the night to settle in and explore the tank.
Seems to work for me.
"When creating an aqua scape, strive for the beauty of imperfection, as its art and there is no wrong or right, it's left open for interpretation" James Findley