Most Helpful Guy
I just turned 26 this month too and I know exactly where you're coming from. I can only really speak from my experiences, but I'll try to answer your question honestly.
In the past I've occasionally met girls that I've considered to be "out of my league", I'd be absolutely obsessed with them and think of little else, but when they showed interest, I'd completely lose interest and try to push them away. For me, it was about the chase, I was never really "interested" in anything about them besides the fact that I thought that I'd never be able to get them, when I realized that I could, they lost their appeal because we didn't really have any chemistry. And then there are also the girls that turned out to be someone else when I got to know them; I lost interest in them when I realized that they weren't the person that I was interested in.
As for advice, the best I can offer is to keep being yourself and not worry about it too much. That way, when you do meet a guy that's interested, he'll be interested in YOU and not a facade that you're wearing or a persona that you're adopting. The cards'll be on the table and he'll know what he's getting into. Also, it's better to strike while the iron's hot and not beat around the bush. Within the span of a few days, his interest can die down if he thinks that there's none in your end. Communicate, let him know that you're feeling something. I'm not saying to rush things or tell him that you want him, just give him something to keep him on his toes and keep the hope alive.
Either way, for now, just focus on enjoying life and being a better you.
Most Helpful Girl
Maybe you're coming on a little too strong.