Any words of wisdom?

So far I haven't had any luck with guys, which is ironic because I always imagined/expected that I would have a bf by now. But all the guys I've fallen for had gfs and nothing ever happened except some flirting. All the guys that have asked me out, I wasn't at all attracted to. I'm stuck in a rut and I feel like I'll be alone like this forever. Even worse, I just met someone at my new job and have a crush, but I overthink everything. I've become too cynical and I just automatically ume that nothing will happen because that's what I'm used to. I'm afraid to really like him because I don't want to get my hopes up again. Has anyone else gone through this? Is there hope? Please don't be rude, thank you so much :)