It seems like my shields are down as they dissappear faster then any other mission I have been on before this, and I can only take on one ship at a time and even that is really difficult.

I took out two of the turretts pretty fast then when I head into the base area there are few more turretts and ships there so in about a minute, maybe less I am waiting for the respawn to be clickable.

I am only level 18, do I need to be higher level? What am I doing wrong?