If anyone besides your target witnesses you using your mind control, then they get to control you for as long as they watched you control someone else.
You find yourself capable of this sheer marvel of physical prowess, but you also find that all the refrigerators in the world must now be opened using a crank, similar to a window crank in an old car. So yeah you can do it, but it's super tedious so maybe it's just better not to.
Side-effect: Your popularity bogs you down, forcing you to eventually relinquish control over the thread and allow others to step in with their ideas. You gain one level of exhaustion, which lasts until you finish a long rest. While affected by 1 level of exhaustion, you have disadvantage on all skill checks and saving throws.
It's not entirely random- it's partially controlled by your emotions. When you are witnessing or doing something that makes you happy, you become more likely to teleport away. When you are sad and lethargic, you are less likely to teleport anywhere. Over time it's a cycle that leads you towards depression if not properly managed.
If you attempt to move any object heavier than yourself, or what you could physically lift, then you fail and physically exhaust yourself for the rest of the day.
When you shift, all memory and record of you is adjusted as though you had always been that form. You can shift back into a human and your life will return as it was, but no-one will ever believe or be convinced that you have this power. Additionally, taking the form of any sort of animal comes with drawbacks such as: -being unable to speak (at least in human tongue) -being unable to write because of a greater anatomical emphasis on major motor skills, as well as lack of opposable thumbs (unless you are an ape/monkey/lemur. Do lemurs qualify as monkeys?).
The very nature of this combo brings about natural side effects. Being invisible, and never having anyone reply to you, you feel a very special kind of isolation- a kind that few people ever will. After enough time this will drive you to madness. Even though nobody can verbally reply to you, they still look at you disgusted by your taboo behavior patterns (when you allow yourself to be seen).
You can solve it, and demonstrate the steps that got you there, but you are unable to solve any other math problem. This includes 2+2. Its enigmatic nature simply eludes you ¯\_(ツ)_/¯
Photokinesis: The ability to control light. You can make yourself invisible, and/or others too. You can make people temporarily or permanently blind. You can shoot lasers, make illusions, and create flash bangs. You can see around corners, see in 360, see in third person, or all at once. This doesn't include creating things out of "hard light", because that's generally just the product of lazy writing.