http://archiveofourown.org/
Just join and post it on both sides. What your friends think about Star Trek does not matter as you can well, let's say, find other trekkers. All you have to do is appropitely fandom tag it. Like, does it take place in the era with Leonard Nimoy and William Shatner? There were two fandom categories Star Trek: The original series. Star Trek: The Original Series (Movies) Or are you writing in the era with Zachary Quinto and Christopher Pine? There is one fandom category for that - Star Trek: Alternate Original Series. Sometimes if you really like a fandom you have to explore it and write in it. No matter what your friends think or say, you have to pursue it. Trekkers are awesome and there are a lot of McSpirk fanfics and McKirk and Spones and Spirk and a lot of nice people on AO3. Though you can't send private messages unlike Wattpad and you can't make bookcovers because there is no bookcovers there. And thank you for the compliment ^.^ Trekkers are picky, too, but you will find a lot of people who read and write heterosexual Star Trek fanfics. Trust me. You'll love it. Post your fanfic and then join AO3. :) I have 1k kudos on there from my collective long list of stories. ^.^