Do not be sorry. Your post is just a little confusing. Being a dental assistant will give you an opportunity to get familiar with both professions. Dental hygiene is very monotonous and boring, in my opinion. At the same time it is easier to become one and you will have less responsibility. The tuition is less, salary is less and you do not have to have your own office.
Dentist - a lot more difficult to become, a lot more expensive. You get independence and headache having your own office with employees and responsibilities. Better pay, more variety of procedures, more respect and pride.
A lot depend on your personality and future plans