Crush on a straight girl / accepting my sexuality

Hi! Sorry for my late reply! I actually have a really simple look, I love wearing black pants and sweatshirts, sneakers like Converse and I just love comfy clothes, so I sometimes wear oversized pullovers. For example, today, I wore a very colorful oversized pullover. Actually it was a rainbow one, so... really gay haha. When I arrived at university, my best friend told me "is it gay pride today?" and I just laughed nervously... 2 hours later, my other best friend came and she said "your pullover is very lgbt" and then "but it's okay right?", she had this smile, it's hard to describe but it was a very reassuring smile. I'm 95% sure she knows because she can't stop making remarks like that, especially because I told her 6 months ago that I wasn't sure if I was straight (she's the only person I told this). She's just waiting for me to come out to her...
I saw my crush today at university, we just talked 5 minutes (I wasn't alone with her, I was also with my friends) but I guess she noticed my rainbow pullover haha. We stopped writing to each other on social media (I mean she stopped) so... If I start a conversation again, I'm scared that she thinks that I am invasive. I don't know what to do... I'm sure that she is straight so if I continue talking to her on social media, I will end up being sad And at the same time, it makes me sad that she stopped writing me, I wish we could write to each other forever.. I mean, this is what having a crush looks like right?

 

Hiii! Oh my god it's been a long time, I didnt see the notification
I came out to both of my best friends in January and they were the most supportive friends! But actually, it's kinda hard to talk to them about my feelings because they don't really know how to help me... I still have a crush on my straight friend and it's getting bigger and bigger everyday because we write a lot to each other. It's also painful because she writes me about her boy crush and she knows nothing about my feelings for her I don't know what to do... do I take the risk to tell her about it? Or do I keep writing to her and have usual conversations? Her best friend (it's a boy haha) is gay so I thought that If I tell her, she will understand more easily but if she doesn't, I don't want to end the friendship we created. I'm so stuck and I'm starting to be really sad about the whole situation...
Alsooooo I came out to my sister 6 days ago and she cried because she was so happy for me and she's actually the best sister in the world !! I was so relieved that at least one person of my family knows about it and supports me