I think real life is once again starting to burrow itself into my subconscious. I've been looking up some of the key parts of my dream, which I'll post underneath.

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Alright, so from what I can recall, I was in the back garden with my older brother. We were painting roses different colours with the knife spreaders that I use at work for spreading stuff onto sandwiches. I was getting frustrated because he was doing all of the ones I was just moving on to, and so I was getting furious. My mum was preferring him to do it, and that just set me off.
I was slashing my left arm with the serrated edge of the spreader, leaving cuts on both sides of my arm. I was crying and I remember I ran off the property, and around some of the houses that are being built in my neighbourhood.

Later on, I'm walking around this street I live close to. It's raining and it's dark, and I'm really jonesing for a slurpee at this one place I get them. I walk up, and I see that the corner store has been turned into a Warhammer/collectable store, which I seem really disheartened about. I start crying and feeling utterly hopeless. IRL, the store's been sold to this couple from this awesome guy who was running it.

I wander around more, and that's where memory fails me.

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Garden: To see a flower garden in your dream, represents tranquility, comfort, love and domestic bliss. You need to be nurturing.

Rose: To see roses blooming in your dream, signifies faithfulness in love and the arrival of a much joyous occasion. Roses also symbolize love, passion, femininity, and romance, particularly if they are red roses. If you see a white rose, then it symbolizes virginity, pureness, and secrecy. It you see a yellow rose, then it refers to infidelity or jealousy. (I can only remember painting them blue, orange, and purple)

Blue: Blue represents truth, wisdom, heaven, eternity, devotion, tranquility, loyalty and openness. The presence of this color in your dream, may symbolize your spiritual guide and your optimism of the future. You have clarity of mind.
Depending on the context of your dream, the color blue may also be a metaphor of "being blue" and feeling sad.

Purple: Purple is indicative of devotion, healing abilities, loving, kindness, and compassion. It is also the color of royalty, high rank, and dignity.

Orange: Orange denotes friendliness, courtesy, lively, sociability, and an out-going nature. You may want to expand your horizons and look into new interests.

Knife: To dream that you are carrying a knife, signifies anger, aggression and/or separation. There may be something in your life that you need to cut out and get rid of. Alternatively, the knife may be symbolic of something divisive in your life. You may be attempting to cut ties or sever some relationship.
To see a dull knife in your dream, denotes that your hard work is accompanied by little or no gain. (Spreaders are dull as shit).
To dream that you are wounded by a knife, is symbolic of masculine or animalistic aggression.

Left arm: To dream that your arm has been injured, signifies your inability to care for yourself or your helplessness in reaching out to others. You may have been feeling limited and restricted in terms of your freedom or activities...your left arm signifies your supportive or nurturing nature and is associated with feminine qualities.

Cut: To dream that you are cutting yourself, indicates that you are experiencing some overwhelming turmoil or problems in your waking life. You are trying to disconnect yourself from the unbearable pain you are experiencing.

Depression: To feel depressed in your dream, foretells of the coming of bad news.

Despair: To dream that you are in despair, signifies that you will have many hardships and experience much cruelties in the working world.

Construction (as in new houses): To see construction in your dream, signifies a new surge of energy, ambition and renewed confidence. It may also represent the rebuilding of your own life.

Night: To have a dream that takes place at night, represents some major setbacks and obstacles in achieving your goals. There are some issues in your life that you are facing that are not too clear. You should put the issues aside so you can clear your head before coming back to it. Alternatively, night may be synonymous with death, rebirth and new beginnings

Rain: To dream that you get wet from the rain, signifies that you will soon be cleansed from your troubles and problems. Rain also symbolizes fertility and renewal.

Closed (as in the store): To dream that the store is closed, indicates your inability to consider other alternatives and other viewpoints.%uFFFD You may be biased in your judgment and opinion. It also represents feelings of inadequacy and frustration.

I don't care if it's tl;dr, it needed to be done.