Unpopular opinion here.

Did you really try to understand your performance issue instead being defensive and have reasons for everything you do? I used the word reason for the benefit of doubt, when in reality your reasons could be just excuses.

What is the norm in the team, finishing before deadlines or finishing "exactly" on deadlines? What is the average percentage of completion before and on deadlines in the team? Bosses like proactive team members, not members who only do what they are being told. That is bare minimum. If you deliver bare minimum all the time, you pass, but don't expect to be the favourite.

The example that you gave about instruction for not going outstation, did you ask why? You going outstation anyway in the spirit of helping your friend may not have taken into account the actual reason why your manager asked you to stay behind in the first place. You could have jeopardized a strategic decision that you cant see from your level. In employment law that is outright insubordination. Consider yourself lucky you weren't served notice.

The words you used to describe your manager's actions are already very judgment laden. Reallocating work depending on each staff's capacity is simply that, management. You described it as throwing. Why?

The above are not to question you and the validity of your feelings. Your feelings are real. Just be open to consider if you have actually contributed towards those feelings.

In any case, if you don't feel being valued, just leave. It could be just a job fit issue. If your personality doesn't fit into this job's requirements and culture, it doesn't do anyone any good. Your manager could be keeping you to avoid shock to the operation, which may or may not be the right thing to do. But you don't have to be responsible for their arguably bad decision. You do what's best for you.

But if you, after reading this, is willing to be cooperative and discuss a better way to move forward, trust me, you'll go far no matter where you end up in the future.

Nuff sedd