A 2-1 home defeat to Dagenham & Redbridge on Friday night was an eighth loss in 10 Sky Bet League Two matches this season, leaving Beattie's boys rooted to the bottom of the table.
"I am bitterly disappointed and it was kamikaze defending but we have got to remain positive," said Beattie, who is in his first managerial role.
"It is serious but I still believe we can win two or three on the spin and then we are talking about a different scenario. I still believe we can turn it around
"We have got to learn lessons quicker and we are all disappointed. Losing is a bad habit to have and winning is the best, and I believe we can get into a winning habit."