Your glasses prescription, in standard format is:
OD (Right Eye): Sphere: -0.50, Cylinder and Axis (none), Prism: 6 Prism Diopters Base Out
OS (Left Eye): Sphere: - 0.75, Cylinder and Axis (none), Prism: 6 Prism Diopters Base Out
In plain English, you are slightly nearsighted in both eyes and your eyes are trying to turn inward or converge.
Corrective lenses are the opposite sign of your actual refractive error. A person who is nearsighted has, in effect, built in reading glasses, but in your case they are not very strong.
The most fundamental equations for optics were Codified by Sir Isaac Newton, of gravity and calculus fame, around 1700. He described the Principles of Optics and defined the Diopter of Lens Power and the Prism Diopter. The most fundamental equation in optics is as follows:
Lens Power in Diopters = 1 meter (100 cm, 1000 mm, or 39.37 inches) / Focal Distance in the same units of measure.
or its re-arrangement
Focal distance = 1 meter / Lens Power in Diopters.
-0.50 means that you cannot see clearly with your right eye beyond a distance of 2 meters
-0.75 means that you cannot see clearly with your left eye beyond a distance of 1.33 meters
A Prism Diopter is defined as that amount of Prism that will deflect a ray of light 1 cm at a distance of 1 meter. Essentially that is a Tangent function with a value of 0.01 the deflection angle is the Arctan function of 0.57 angular degrees per Prism Diopter. 6 Prism Diopters means that your eyes are trying to turn inward about 3.47 angular degrees each. You notice it as double vision, but the actual pupil displacement is so small that others can't see it. FYI, I am wearing 7 BO in each eye as I write this.
What others may notice is a bit or extra thickness in the outside edges of your glasses by about 3 mm. I know this might sound strange, but that might actually work to your initial benefit, in addition to helping you fuse the two images.
Sometimes people are concerned about people saying that you are wearing glasses that are "too weak". Frankly, that is a really dumb comment by someone who doesn't understand optics. No one has the right to dictate how bad your vision needs to be to justify vision correction. As I demonstrated above, without correction, even your low prescription significantly affects what you see. The prism correction will add a bit of thickness to your glasses and minimize dumb comments.
About playing basketball, you could correct your mild myopia with contact lenses, but contact lenses cannot supply Prism Correction. Right now you need glasses for that and you may want to consider sports goggles for basketball, they will correct your double vision and at the same time correct your myopia. The goggles have a retaining strap so you won't have to worry about them getting knocked off. They are almost un-breakable.
It is possible that your prescription will change some in the future and you may need a bit more prism.
I have a young acquaintance who needed substantially more prism correction than you do. He loves Soccer and he plays goalie wearing sports goggles. He tried it with regular glasses, but that is a rough position to play with regular glasses, they got broken a lot.
I hope this helps. Please don't hesitate to ask if you have more questions. I have a couple of other things I would like to discuss, but this is enough for now. When will you get your glasses?