I’m scared to be single at 25 (24f)

My boyfriend and I have been together for a year and a half and things are slowly getting worse and worse, and I just know things aren't gonna last much longer. We have different values, I haven't been attracted to him in months, and I just don't think we want the same things. HOWEVER, we live together which I really enjoy! He is my best friend, and I understand I'll feel quite lonely after we break up. I'm just scared to be single at 25 (my birthday is in October) because I already feel like I'm "behind" or I'm late to the love scene. I'm also scared of dating shitty guys again because my current bf is a really great person, and it's so rough because I genuinely thought I'd marry this person. I just need some advice right now