Hello! I am new to this whole cycling thing (have biked since I got my Drivers Liscence 4 years ago... )

I am having one difficulty thus far. My butt hurts like crazy! Is this just a first-time-in-a-long-time kinda thing? I bought a scwinn ergo gel seat thing, and it did help, but I am wondering if I need more? or if I should just suck it up, and itll go away in time. I ride back and forth to school, about 15 min a day...) I do have a larger-than-average rear end, and am about 15-25 pounds overweight (that is to say, that is about how much weight I desire to loose).

Thats about the only question I have so far...

Thanks all!
ltcol266845