My wife is 23 years old, she is not interested in sex or watching any porn movies, i easily get aroused by seeing her but she has no interest in sex.

Tip of the iceberg: Meaning, there is a lot to be found out, talk to her and see what's her take on it. Was it a convenience marriage?, Has she ever been interested? Is it only you, is it now but not before?, what's changed?. If dialogue doesn't flow, there are marriage counselors that will help to improve communication and deeper understanding of your problems, all towards an a resolution of your issues.

Seems to be a bit: young to be so asexual, but there are MANY causes of lack of interest in sex. Start with a frank conversation about the state of your relationship and schedule an appt. with a sex or relationship therapist. Concurrently, have your wife consult with her OB-GYN for a hormone check. Any medications on board? (Side effects) Let your MD refer you from there...

Communication: What's it like to communicate this to her? And does she say why she doesn't want it? Speaking very generally, the more sex is talked about openly and honestly, the less anxiety there is, which, in turn, makes it more likely to occur.

Marriage Counseling: It may be that you and your wife are not on the same page regarding intimacy. What you think is arousing, isn't working for her. Talking through these issues in a healthy manner will be helpful for your marriage. Avoid judgement and listen to your wife's concerns.