Negative feelings

Q: My question is that I am suffering from inferiority complex. I mean despite having friends, good family, beauty, money and all these, my heart is not satisfied. I only think with myself that I don't have any friend, I get serious on small jokes of my friends, I get too much tension from small things. I think that the people are ignoring me, if two of my friends are going closer and I am a little on distance with them I feel that they don't care of me, whenever I look to the handwriting of my friend my heart says that there writing is better than mine. Simply I would like to say that I have no peace of heart and mind and I always consider myself smaller than others. Please tell me the reason and treatment.

Not paying attention to futile things

Q: Sometimes people have these strange looks in their faces that is annoying and sometimes they can't help it. You realise this when you are having a conversation with them. I want to know, please can this be linked or traced to hypocrisy or mental behaviour of the face, insincerity, or due to effect of sins done with the face or any form of sins? Please I want to Know.

Fear of committing shirk

Q: Please tell me whether I committed shirk or not. I was praying Salatul dhuhr and shaytan was really pestering me with whispers, now in the final sujood I decided to recite this ayat in surat Yasin "Alam aahad ileykum ya bani adam an la taabudu shaytana innahu lakum aduwun mubin. Waanibuduni hadha siratun mustaqim". Now the part that is really stressing me out is that I wanted to let shaytaan know that I am following Allah's path so after the ayaat I said "wa ana aabud or wa ana aabudu.."something like that and I stopped and thought I had committed shirk (even worse because I was in sujood) maybe implying from what I had said that I was worshiping shaytan (wa iadhu Billah min dhalik). Because I don't know Arabic and I tried to conjure that in Arabic. Please if you could tell me if what I did was shirk or not and did it refer to shaytan or something?

Becoming a kaafir through breaking one's oath

Q: It is narrated from the Prophet (blessings and peace of Allah be upon him) that he said: “Whoever swears (if he does something or fails to do something) that he will follow a religion other than Islam, falsely and deliberately, then he is as he said, and if he meant what he said, he will never come back to Islam with his faith intact.” My question is if a person swears to Allah that he will never do a particular act and if he does it he will die a kafir. If he breaks his oath will he die as a kafir?