Believe me, you’re not alone! I’ve been playing piano off and on for several years, and I still have some trouble with chords in the left hand. The main reason for this is because I didn’t and still don’t practice consistently with that hand.  When I was younger, I focused on my right hand because it was easier, and that really hurt me in my progression with both hands. My advice is to spend most of your practice time on your left hand until it feels easier (but don’t practice to the point that you make yourself frustrated).