Negative feeling with Offer rejection

Hi Folks, A wierd thing happened with me today, I let go Nokia offer who were ready to offer me 20+ Lpa, since I had already comitted to Comcast and Comcast is ready to offer me remote work and joining with Comcast is on March 16,but role in Nokia was blended with Both Automation and Development, honestly I am regretting very much for letting go the Nokia offer which was a reputeted and a well known company, I am feeling very depressed before joining Comcast I think I am going to rot in hell at Comcast and also Nokia I hadnt made much effort it was through referral from my uncle, but where as I acheived Comcast offer through my own effort, guys please give me some positive suggestions and thoughts before joining Comcast