The behavior your baby Oscar is showing is common. As for tank mates, that depends on your tank's volume and size.
One of my Tiger Oscars took some time -2 to 3 weeks- to feel comfortable with my presence, now they both eat from my hand. Keep the lights out most of the time, and avoid sudden movements and loud noises. Take your time to interact with your oscar, and provide him/her with time on his/her own as well.
Please check and post your water parameters ( Temp, pH, Ammonia, Nitrites, Nitrates, and if possible dGH, dKH? ).
If you are concerned about loneliness, consider peaceful and easy to keep tank mates as a small school of five Silver Dollars. Also read the articles on oscar-fish-keeping in this site; there's a lot of easy to understand valuable information there.
Pepe
Santo Domingo