No. "Paying for personal things when I worked" is very unlikely to add up to more than half your support. But that's not the deciding factor. The real question is: did you have more than $4150 of income for the year.
Another thing you should be aware of: if you are a wage earner (and no other significant income), it no longer matters whether you claim yourself or not. Your tax (or refund) is the same either way.
There are two types of dependents, "Qualifying
Children"(QC) and standard ("Qualifying Relative" in IRS parlance
even though they don't have to actually be related). There is no income limit
for a QC but there is an age limit, a relationship test and residence test. Only
a QC qualifies a taxpayer for the Earned Income Credit. They are interrelated but the rules are different for each.
You cannot be a QC because you are over 18 and not a full time student. So the question is can you be a standard dependent.
A person can still be a Qualifying
relative dependent, if not a Qualifying Child, if he meets the 6 tests for
claiming a dependent:
1. Closely Related OR live
with the taxpayer ALL year
2. His/her gross taxable income for the year must be less than $4150 ($4,050 in 2016-17)
3. The taxpayer must have
provided more than 1/2 his support
In either case:
4. He must be a US citizen or resident of the US, Canada
or Mexico
5. He must not file a joint
return with his spouse or be claiming a dependent of his own
6. He must not be the qualifying
child of another taxpayer
