I am 19 years old with no established credit. I will be using the credit card mainly for groceries, gas, clothing, and occasional online purchases.I am not concerned about the interest rates because I will be paying my bills on time. I would like to know what credit card has the best benefits for my lifestyle.

The best I've found so far is the Discover Student Card. It has 5% Cashback on popular purchases (travel, home, apparel, gas, restaurants, movies, and more) and 1% Cashback on all other categories. It also has 5% to 20% Cashback through their exclusive online shopping site, which I'm not really sure how that works yet.
since this is your first card, i would not go with Discover card only because they are not accepted everywhere like Mastercard or VISA cards are. try looking for "college student" cards (assuming you're a college student) because they're usually easier to get and those with no annual fees. Also sounds like because you will be using your card for groceries, gas and such, perhaps you should apply for the cashback cards that offer you "double cashback" for those categories. Check out Citibank's platinum cashback card or CapitalOne's via their Card Lab.

also, if you want to learn more about how Discover card's rewards work, read this review. http://www.askmrcreditcard.com/discoverplatinumcard.html It really discouraged me from applying for the card, that's for sure. Sounds very complicated and time consuming.

you can also go to www.creditcards.com or www.cardratings.com to compare all of the different cards out there and pick the one that is right for your lifestyle and rewards you the best for your everyday common purchases.
SOUNDS GREAT!!! Discover is not accepted everywhere like VISA, but the places you are planning to go look like places that Discover will be accepted. Just use your checking account when discover is not accepted.
Call every 6 months to get a lower interest rate and call every 6 months to get a higher credit limit.
Also in the future, consider an AMEX Blue. This card is great, it gives you 90day accidental damage(for free) on most items you buy. It also gives you a free (1yr warranty) on top of manufactures warranty for most purchases. This card has an awesome rewards program. It has no annual fee and u can pay over time …. many many more features. IT's not a credit card to get for someone building credit. BUT get this card after 2years of good credit history. Master card has some good benefits too.
NONE! but if you HAVE to have ONE, just get a Master Card or Visa. To keep your credit up. BECAUSE you can use those two anywhere. Keep them for emergencies. Don't use it unless you have to. Those store credit cards like Target, Sears, stay away from them because of the INTEREST!. Just get a Master Card or Visa. (They will have enough interest for you) Credit cards changes didnt' help the consumers. It just gave the other credit card companies new way to still get their money. They figured away around that.
I agree with your analysis. At CreditGumbo.com, we have done a lot of investigation and like the Discover Student Card.