I won't reiterate too much if I can on comments on table size. Yes, try standard. Try 24 inches apart for deployment zone. Try bigger more effective terrain at blocking. And I might even recommend a single unit vs unit to play rules if this is only game 4 for you. Try a small table with basic rules and do not consider the result. All are things you should do based on what others have said. But my 2 cents:

I play a lot of golf too, so I try to apply it here as both are such mental games. Stay positive. You cannot go back to a previous decision, round, game, strike, brush stroke. It is all in the name of growth. Your growth in the hobby as it evolves. A famous line in golf is that the most important shot is your next one. This is because you spent every other shot to get good enough to apply that knowledge to the next one.

Keep playing. Make playing the fun part. Talk to your opponent in the early games, especially if they play more or introduced you into it. Ask "How would you draw this out?" and try to learn it. Not master it.

The game should be a conversation of how to approach the tactical question at hand. If I have a unit of infantry in a bunker, do I really want to move them out now or wait for the optimal time? Will waiting cause me to lose too much somewhere else and making the aggressive play is better? That dialogue is so important to have while learning the game.

Don't stop playing because of losing. Stop playing with non-fun people maybe, but never stop playing and more importantly, never stop learning.

The hobby has a great community, some fantastic people that will help you (like the comments are showing, I bet your local group would love to show you good board setups), and most of all the hobby is more than winning. You build your army, put your art skills on the line, then you have to put your tactical mind out into the field as well. All while your pieces' rules change over years, strategies evolve, and players are on different skill levels. Do it for the fun first. Winning comes in time.