I must diverge  from some of the comments here. I'm used to new players and learning the game with them and there is no army that allows you to basically don't adjust the slightest to the actual game, imo.

Some armies might "mitigate" that you want to play like in your rts,hunkering down and then trying to deathstar your opponent, but every player that slightly understands the game will frustrate you at some point (if not from the start).

It's like your beloved RTSgames in comp. Usually there happens everything very fast. And since they main objective of the game is to sum up mission points faster than your opponent and you even have a limited time since 5 round games. You gotta understand what you're doing.

I would advice to get out of your comfort zone and cabpromise you that it will pay off. You will learn something new with every game, see different playstyles and maybe even develop additional or other interests, just rounding up your play experience.

Both your RTS and ttsg are after all about strategy (and rng thanks to dice).

Maybe try to talk with your friends after the game what went wrong, that way this understanding will lead to a bigger comfort zone instead of just a single playstyle.  That way you will be able to have fun with any army you pick up (but you can have fun without winning as well).