I have that fear. I am 25 now and it's hard of me to accept that someone would want to be with me after I tell him what I have. Most freak out! Which I understand cause no one wants to be with someone who is constantly sick. No fun
But I also know that God has great things in my future which I am determined to be happy in. So if he wants me to find a fella then I will and he will accept me as I am. But to answer your question yes, I do fear that I will never marry now. And I also agree with the cost of MS. I am not sever that I am on SSI or SSD but I have group insurance through my job, which I work for the state, and it is still insane amounts.