I am an ally as well and I sort of know how you feel. Just continue to accept people and treat them with respect, and soon it will not feel so strange anymore.
If you are worried about people being anti-straight, let me assure you that's not present here. I've only seen one meme like that in my time on this stream(which has been for around a year now). Sometimes people generalize, however those memes are aimed at those who are anti-LGBT+, not straight people as a whole(although some of them can appear that way).
This stream welcomes you no matter your gender or sexuality.