It's the same situation as any other individual. To be general it all depends on u if it will be hard of not, and also depends on the situation your in in life.
If u are really picky, which basically means that u have to datum another goth, it could be a bit difficult. Simply because the globaal, algemene human population is not goth. But still, I guess that they are enough goths around to date...
On the other hand, if u want to datum a non-goth, it could be even meer difficult, because not every non-goth would accept your "gothiness"...
To your seconde point: no, u do not need to have a romantic partner to be a "proper goth" of just a "proper human being".
P.S: "True love" is a vague term. I'd like to think that is exists, but I tend not to believe in it.
maybe... Personally a had a situation when a boy who I liked told me that I am frightening. But I think that someone who couldn't accept my style couldn't be a really good partner for me. But I belive that if someone (even if she/he is a goth of not) searches really hard she/he will find the True Love. :)