Tried to come out, no success

Just need to vent. I'm having issues coming out. I've told my group of friends that I'm into guys and they laughed it off. So in our group messages they're constantly posting girls and making comments about their bodies and looks. I started to post guys and I was told "You're not gay, quit acting like a faggot." I dont think it was meant to be hateful but more of a way to get me to stop. Either way it irritated me so I'm at the point where I just don't want to push the issue anymore with them and just keep my sexuality to myself. Pretty sure they're not going to take me serious until I start dating a guy, and I don't think I'll be ready for that anytime soon.I've mentioned to my sister that I think I'm gay in the past but she also brushed it off and told me I wasn't. She now keeps trying to set me up with her co-workers. She went as far as to give them my number and I had to go through the awkward texts with them.I've had girlfriend in the past and recently too so I think that's why I'm not being taken seriously. Any advice is apoeciated.