The question is "can you be claimed as a dependent" by someone else, which is slightly different concept than "am I independent."
You can be claimed as a dependent by your parents if you live with them more than half the year, meet the age and full time school requirement, and don't provide more than half your own support.
I won't go into the age and school requirement here unless you ask. For "lived with" your parents, your parents are allowed to consider you as living at home even if you are away on a temporary absence, and being at college is almost always considered a "temporary absence," since in most cases the student returns home for breaks and summers. If you have definitely moved out and won't be returning, then you might not be considered to live with them any more.
For support, "providing your own support" means money from your own earnings, savings, and loans you take out in your name. Scholarship money and gifts that don't have to be paid back does not count as support you provide yourself. Your financial needs include tuition, rent, food, utilities, travel, and medical expenses. If your parents provide you a home for 3 months out of the year, and if you are on their medical insurance, that counts as support you don't provide yourself, along with any direct expenses they pay for you.
You may need to make an inventory of your financial needs and expenses, and how much you provide, and how much is provided by others, to calculate if you really provided more than half your own support.
Most importantly, try not to claim that you are not a dependent if your parents claim you as a dependent. This will start and IRS investigation of both of you, and you don't want that. You and your parents should be in agreement if at all possible.
