I'm like this too. I have this personality that works better with a plan so these are some that helped me:
+ I started with small, achievable goals.
Tasks can seem overwhelming, either because they're too many or too big so I break them down. I start with just 3 small things. Once I'm done with them, I start another 3. It's important to keep them specific, small/easy to do, so you are guaranteed to achieve them. Example: if I have to clean my messy, out-of-control room , I list down :1.)sort out papers in desk; 2.)return books in bookshelf; 3.)gather all tech stuff (phone, tablet, cables, chargers etc) from desk into 1 place.
After that it's 3 new things: 1.) Fold all clean clothes into closet; 2) toss all dirty clothes into hamper; 3) Color-code my clothes in the closet
+ To-do list/goal list. I really got overwhelmed when I first started so writing down what I have to do made me more organized and committed to doing them. Also, this is important because after finishing them, I got an unbelievable sense of achievement crossing them out as done, even if they were just small tasks.
+ Reward yourself. To motivate myself, I promise myself a reward when i finish every 3 tasks. It could be delicious food, a chapter of book I'm reading, even the freedom to browse social media for x number of minutes, guilt-free since this is a reward for your hard work.
+ For distractions like you in social media, you could try setting a time limit since it's hard quitting cold turkey. Like, surf social media for 30 minutes, after that mute your notifs and put your phone inside a drawer while you're about your tasks.
+ Be kind to yourself.
I'm told: Would you say to a friend whatever you've been saying to yourself? If you can be kind to others, you can be kind to yourself. After all, nobody's perfect; everyone has their own version of problems and sufferings.
+Talking Potatoes.
This is just sort of related, but this helped me a lot so I'm putting this here too.
I have depression and one of the things that got me out of the bed is this habit app called Talking Potatoes. They have anthropomorphic potatoes that you plant once you want to start a habit. You have to check in after finishing your task each day otherwise your cute potato (they have different personalities) will go to the potato graveyard. I didn't want to be responsible for killing off such a cute, innocent potato so it got me doing my task (which was just taking a bath each day no joke). It might be cutesy for some and yeah, I basically emotionally bonded with a fictional potato but it was effective in a way to me. There are alternative habit apps anyways.