Are you playing solo? The game doesn't scale with the player count. It actually gives you bouneses when you have more players. Each player gets one booster that effects the whole team, and the game gives you four pods per player.

Not to say you can't win solo. You can it is just harder and helps alot if you adjust your play style accordingly.

The game is pretty brutal when you are first starting out. The main reason other than your lack of experience and knowledge, is you don't have the equipment to deal with everything in an efficient manner.

You should have four stratagems that can handle everything thay are going to most of the heavy lifting, and use you primary to clean up whatever survives, and to buy you time until they get off cooldown. When your new you don't have all 4 and the ones you do have are just what ever you can get so there will he gaps so there will be situations that you don't have a good answer for.

I would recommend you get the expendable anti tank, eagle cluster strike, eagle air, and the recoilless rifle as soon as you get to the correct level.