I'm not sure if the link will work since my profile is private if it doesn't show let me know and I'll open my profile but I'd prefer to keep it private. This is a video of me shooting maybe you guys can spot something wrong besides me going out of position on everything. At my uncle's I was shooting fine for my level out of position but able to pocket balls which makes me think it's a mental problem. Sorry for the quality a bit the video size was too big in hd.
https://www.facebook.com/video.php?v=817524751635769&l=7670484489124981855
Ok. Before I start I would like to make it absolutely clear that I am not an instructor, nor a pro player. Having said that, I saw some things that you might want to work on in that video. The fundamental bits are things that was taught to me by a top snooker instructor to cure the exact same problems you are having. The first one is just common sense

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1. Before I start on any of the fundamentals stuff I'd like to comment the very first shot after the break. Even if you disregard everything else I say, I hope you listen to this piece of advice: Whenever you have a GAME BALL hanging inside the pocket like that and you have to shoot a similar combination to what you had there, you NEVER aim for the center of the game ball! You have a huge target to hit up the long rail, as well as on the ball . The center of your target (depends on the bouncyness of the rails) is way left on the game ball or even missing it to the left(as you look at it). There is no excuse to undercut that ball!
2. You are standing very tall at the table and using a variety of foot positions. Unless you have health issues that force you to stand tall, you should try to get much lower in your stance. That way it is easier to see the long shots clearly.
3. You approach each shot differently and inconsistently. Try to take an extra step back from the table each time you approach the shot and walk into it from the front, instead of sliding in from the side. That way you get the chance to do the same routine every time.
4. To me it almost seem like you don't plan your shots ahead. When you take that extra step back you should stand for a second or two and think of exactly what you want to do with the cueball. Have a precise target spot in mind, not an area. Then you must figure out the tip position and speed necessary to do that. Only after this has been done should you step into the shot.
5. You ran into the 4 and 8 for no good reason. Running into balls like that will eventually lead to disaster, like it did on the position on the 5 ball, hitting the 8.
6. If you really want to learn and do some work, you should set the balls up exactly like they were after you missed the combination and then try to run them out without touching any ball and without shooting any combinations.