At nineteen years old, you are very young, and it can be normal to fear sex. You will have plenty time to grow, mature, and perhaps see the things differently. And also maybe fall in love.
Presently, it is possible, and even completely normal to not want to have sex if you have nobody with you wish to have it.
Things can change is you met someone that you will want to marry.
It is possible that sex will not stay something that you will desired much, but there is a world between “never” and “yes, but only holly, will not turn myself to total decomplexion and want it all time”.
You can have an happy marriage, but if you plan to marry someone, and still feel a low sex interested, you should make sure that the person will not be too much interested, because it can create untenable tensions on the marriage.