Advice on sex life with wife

I am a 30 year old man, married for last 5 years and we have a child. We both met in sweden and lived together for about 8 months. Then my wife got pregnant and went back to US while I stayed back and continued working. Still we see each other after every 6 months for few months so we could spend time together as a family. The problem I face is that I do not feel like having sex with my wife anymore which is creating some serious problems between us. My wife always craves for it but when we are together, I try to avoid it or when we attempt to have sex, I cannot keep an erection, I feel very pressured(pressure of what if i can't keep an erection) and feels like I am having an anxiety attack. No doubt my wife is very beautiful but I don't feel any intimacy from her like I use to in the beginning of our relation. At times she gets really furious when I lose my erection and of course it makes me feel worse about myself. I have tried many different things except Viagra but nothing seems to work. She even opened up about watching porn together so I could stay hard, we tried that once but it made me release embarrassingly fast plus there are 100 feelings running through my mind at that time. I have been in bed with women much better than my wife but nothing to complain because my wife is down to anyt hing. On the other hand when my wife is away from me, I feel extremely sexually active. I get intimated even looking at pictures of girls wearing clothes(only pictures) & porn makes me even more hornier. But the problem doesn't end there, I have even slept around when my wife isn't living with me. But I realized 2/10 times I am unsuccessful mainly because of lack of intimacy. When I look at my life, I realize that sexually I am more satisfied with what I see online than real life people. Soon I will be living with my wife permanently and I am very worried that after first couple intercourse we will face the same problems in the bed again. I love my wife & child more than anything in the world but at times it makes me very nervous how can I sexually improve our relation. Please advice me how to save my marriage.

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