Positional playing

If I want to be a good positional player, do I still need to use an established opening? It has been difficult trying to remember all the steps for a white opening and then a different one when I play as black.

An established opening isn't necessary. However, tricky gambits will often lead to tactical, rather than positional games. I would recommend the Queen's Gambit.

Open games (1.e4 e5) tend to be more tactical while Closed games (1.d4 d5) tend to be more positional. It has to do with how the pawns occupy the center.
So as suggested above, the Queen's Gambit is a great opening for positional players.
If you want to learn more about positional concepts I can suggest you the book "Secrets of Modern Chess Strategy, advances since Nimzowitz" by John Watson.

Yes, using an established opening helps, even for positional players—but you don’t need to memorize deep lines.

Play over annotated games. Don't memorize openings, just follow general principles. A good book is an old one called How To Open A Chess Game, by 7 different authors, all legends of the game.

Aaaaand PAWN STRUCTURES. Learn about that, it'll guide your planning/strategy.

It is more useful for you, at your current skill, to be doing puzzles and training your board awareness. In your most recent game on this website against a bot, you missed a free rook on move 4 which is far more concerning than not knowing an opening.

Now, that's embarrassing. I didn't know my games were out there for everyone to see. Actually, I had been winning against bots a while back and suddenly took a dip in skill and confidence. Of course, that was a huge blunder and at that point I considered giving chess up because I usually do much better than that.

Ina nutshell positional play is long term advantages. Tactics are short term.

You cannot have one without the other.

Thank you.