Nothing wrong with being a grunt. It's not for everyone though. My little brother was grunt (0341) with 2 tours in Iraq. Four years was enough for him.
How'd you do on the ASVAB?
One thing to consider is that if you are interested in a career you should consider other MOS'. The reason being is that infantry is very competitive (as are some other MOS') for promotions past a certain point. If you plan to get out after your first enlistment (I suggest not having this attitude, but many do) than I would pick an MOS (If it fits the needs of the Corps.) that interests you/is what you eventually want to do as a civilian. Getting a job after being a grunt is not an easy task. If you want to be a grunt though, make sure you make that crystal clear to your recruiter or he'll push something else onto you. Now, having not signed, is the ONLY time you will have any leverage in the USMC. Use it.
Quick story, a friend of mine is a F/A-18 engine mech (Don't know MOS #) who, after 11 years, is basically being forced out because of promotion limitations. It took him over 4 years to hit Cpl and 8 to hit Sgt. There's almost no chance he'll get SSgt. That said, he's not some turd, he's a very good Marine (He was NGJ'd once, which is hurting him a lot). On the flip side, I knew 2 year Cpls in other aviation MOS' that shouldn't have been allowed to go to Parris Island let alone wear a Marine Corps. uniform.