"I'm 17 years old and making around $8000 a year at my partime job. All of my friends that have jobs only have to pay social security. This year I got half of my state and federal back, and I'm wondering if i should be getting it all back."
I ran a quick tax calculation based on your scenario. I made one crucial assumption about your tax situation. I assumed that someone else can claim you as a dependent (such as your parents).
Based on this scenario, you would owe taxes on the income over $5,000. The first $5,000 of income is tax-free to you because you are entitled to claim a standard deduction.
You would fall into the 10% tax bracket, which runs from $0 to $7,300 of taxable income for single people. So your federal tax would be about $300.
If you cannot be claimed as a dependent, then you would pay zero federal tax. That's because you would be entitled to claim a personal exemption for yourself.
Your friends who are paying only Social Security and Medicare taxes might have income less than you, or might be able to claim their own personal exemptions. It is often very hard to compare your tax situation to someone else's tax situation since there can be significant differences that you might not know about.