I exclusively play the LONDON system as white and against e4 I the SCANDINAVIAN defense as black. Is the LONDON just bad? Do you have any tips?
Why do I win more with black pieces than white?

1. The Italian Game
The Italian Game begins with the moves 1. e4 e5 2. Nf3 Nc6 3. Bc4. It is one of the most versatile openings for white as there are lots of lines that stem from it such as the fried liver attack or the evan’s gambit which I would recommend looking into
2. The Ruy Lopez
The Ruy Lopez starts in pretty much the same way as The Italian Game except for the fact that instead of 3. Bc4 you play 3. Bb5 attacking the Knight on c6 and therefore challenging the pawn on e5 as the knight is its only defender at this point
3. The Queen’s Gambit
This is another opening that is extremely popular and has a large amount of lines, It starts with 1.d4 d5 2.c4 here you sacrifice a pawn to gain center control, there are multiple variations to learn such as the main line (queen’s gambit accepted) where black takes the c4 pawn, one of the best responses by black is the queen’s gambit declined where they play e6 to protect their pawn rather than taking, the albin counter gambit where black plays e5 in response to c4 etc. This is probably one of the most interesting openings in the game.
4. The Danish Gambit
This is one of my personal favorite openings, it is very aggressive but it makes it so that if you know the lines well and your opponent slips up, you can instantly grab an advantage or even win! This opening involves sacrificing either two or three pawns, depending on the variant to either gain a developmental advantage, the two pawn sac variant, or get both bishops on a long diagonal, the three pawn sac variant. I would definitely recommend looking into it.
5. The Alapin
This is a response to the Sicilian defense and if played right, it can be one of the best openings. The Sicilian defense is one of the most versatile openings for black with loads of variations such as the Dragon, Accelerated Dragon, Hyperaccelerated dragon, Paulsen, Kan, Prins, Najdorf, Dragondorf, Scheveningen, Taimanov etc. It has a very deep theory line, learning to play or defend against it is a hard task but as you get better it becomes a necessity since at a higher level it becomes even more common than 1. e4 e5, The Alapin is a good place to start learning how to play against the Sicilian, It goes 1. e4 c5(the Sicilian) 2. c3 and then goes further into theory, I highly recommend learning it.
There are also lots of options for Black but since your question was about white, I won’t explain them too much and I’ll just list them instead. Feel free to look into them:
1. The Sicilian
2. The Scandinavian
3. The Caro-Kann
4. The French
5. The Traxler (A counter attack to the fried liver attack)
6. Alekhine Defense
7. Nimzowitsch defense
8. Slav Defense
9. The Nimzo-Indian
10. The Regular 1. e4 e5 Game
Hope This Helps!

The London is really a pretty drawish opening (Carlsen's successes with it come from his supreme ability to squeeze out a win from the smallest advantage) while the Scandinavian is based on counterattack. Your playing style may be more suited to attack than defense. Also, it is often easier for beginners to play black, as you can see what white is trying to do and counter that, while as white you try to maintain the initiative and must come up with a plan on your own.
Try out a variety of openings and defences. When you stumble across a few that you understand and give you positions that you like, study them.

... while the Scandinavian is based on counterattack.
Some side-lines, maybe. The main-line Scandinavian (with ... Qa5 and then ... c6) is just a tempo-loss variation of the Caro-Kann. Compare the Pawn structures and typical piece placements.

I play the LONDON. The LONDON is a good opening. It bores the opponent to death.
The French defense is a good opening. You should look into it.

I always play the French vs 1.e4. I like most variations, but in the Tarrasch I resign myself to aiming for a draw unless white tries too hard and makes a bad mistake. Of course the exchange variation pretty much offers a draw on move 2. In the London, if black sets out to exchange black-squared bishops asap he can hunker down and keep things drawish, unless white press too hard and leaves an weakness than can be exploited.
PS--Check out Moskalenko's books on the French.

Emms has a book called First Steps: 1e4 e5. He spends most of his time on the Italian game (which he suggests is best for someone who wants to starting using principles for an opening, rather than a "system") and almost as much time on Ruy Lopez. He also has a chapter on the Scotch.
Do you have a different style of play with white or black? Do you tend to be more aggressive as white and defensive as black?
In that rating range, games often hinge on blunders or lack thereof. If you stick with good fundamentals, your opponent will often make unforced errors. Keep your pieces from hanging (easier to do defensively than offensively). Keep your pieces mobile. Gain space. Be flexible to attack when the opportunity presents itself.
Without looking at your games, I am guessing you are being more patient as black. Does any of that resonate with you?