We all have them. Some good. Some bad. But we have them.
Knowing them is key. Getting balanced and aligned with good singing technique will surely draw attention to your habits.
If your teacher is good, she will set you up with exercises that will counter your bad habits, and work the muscles that will set you on the path … slowly … one coordination at a time.
This is hard to do with self-taught programs. How do you know if you are doing a coordination correct? How do you know if your habit isn’t stopping you from proper alignment and balance.
That’s why you need a teacher to guide you. A good teacher. A teacher who is on the same page as you are.
Never under-estimate the value of a proper guidance and feedback. All the self-teach singing methods in the world will never replace a good teacher. Get on the right track first with a solid foundation. This is the quickest and most direct way to better singing.