I'm going to work on personal projects at work
Why do you want to work on personal projects at work?
I'm feeling pressured and I don't like it
Even though you are under pressure to complete the project, it is not good to do it at work. You can get caught and get fired.
What is wrong about working on personal projects at work? At least I'm still working.
Yes, but you are working on the company's time and your boss would not appreciate that.