I was really inspired by Krishna, The Supreme Lord... After reading Gita. I became his devotee (not pure one), before reading Gita I was still his devotee... Whenever I used to think of him... I used get extreme energy that motivates me so much... But when I read Gita it felt like all I did before was wrong... Now everything I do feels like I am doing wrong... I have become so judgemental... Before reading Gita , I always believed that he is with me but after reading it... It feels like I am becoming sad everyday... I don't know what to do. I am thinking of Becoming Devotee of another lord. Will god get angry? I don't know what is wrong with me. Anyone please give me suggestions... and yes, I am not after moksha, it's not the best for me... I am in need to fulfill my material desires..
The simple answer to your question is NO he won't get angry.
As far as I remember Krishna himself mentioned that, he resides in all and all resides in him (e.g. Vishwa-Rup). He also said that if you are worshiping any god, he will come to you in that form as all others are his forms only. So worshiping any one of them will finally lead you to him. (No problem there). But worshipping Krishna is considered best, as he is the supreme god.
Apart from that, I don't remember any text where it is mentioned that one God may get angry upon worshiping others. (I think this concept is prominent in Greek gods, not in Hindus).