As far as I searched for you inquiry, I didn’t find a related matter that your Nikah (marriage) is invalid. But I found a related issue which could be profitable for you.
According to Islamic rules, this is the duty of men to supply the sexual needs of their wives. According to Islamic rules, such men (who do not..) are sinner, and in accordance with the law, the wives have this right to refer to the court to divorce in the case that this behavior of the men caused difficulty and sin.
Besides, you’d better to refer to a good psychologist to solve your problem. And you’d better not to allow devil to make you such feelings. Therefore you should trust Allah and say Besmellahe-Rahmane-Rahim and start a good relation with your life.
There is a nice tradition from Imam Ali (a.s.) that could be so profitable for you to read and practice it that declares:
Whenever you are afraid of something, put yourself on it (logical
things), that occasionally fearing that thing is more significant than
outer reality. (Hekmat 175 Nahjol Balaqah).
Actually this tradition declares that you should do whatever you are afraid of. (about rational matters). So I reckon your matter is similar to that hadith. In truth, as I said, you’d better trust Allah and ignore your phobia and don’t allow Satan destroy your life.