This is going to be super long. I'm questioning my orientation?

Hello! First let me say I am a female in my (almost) mid twenties. I have always been straight or so I thought. I've always had a boyfriend. I tend to hop from guy to guy. My mom says it upsets her and she wonders what I'm searching for. I've been with quite a few guys and I have never ever had an orgasm with any of them.

A few months ago I started working at a new job. I met this girl. She's a lesbian. She is not very feminine. Very short hair, prefers to dress more masculine, etc. We became friends from the beginning and got along very well. We were kind of flirty with each other. I tend to be a flirty person so I didn't really look into it at all. I was just having fun. I'm not sure if I'm allowed to go really in depth but we were pretty touchy with each other and then one or two times it was definitely pg13 kinda stuff. It drove me crazy and I really really enjoyed it. I found myself seeking her out at work. Trying to be around her more and more. And then she got a girlfriend and I found myself jealous. And upset because she had been showing me all these little flirty gestures and our knees brushing up against one another under the table and holding hands and stuff. Part of it was just joking and flirting but partly serious too. And it really got me looking back on my life. All those times in elementary school and junior high and even high school. Where I would meet someone new in class and I would think she was the most cool, interesting person ever. I would admire these girls, want to be like them, want to hang out with them. Not just in the way that someone who doesn't have friends longs to be friends with someone. I'm not sure how to explain it, but it made me wonder if these were just me admiring these girls and looking up to them or if i had some kind of little crush on them? The one girl from work was the first time I have ever been really attracted to a female and realized it. I'm just feeling confused and im not sure what I'm asking for here. Maybe just opinions or your experiences or whatever you can give me. I know this may sound bad but I really just want to get out there and test the waters a little and see how I feel afterwards. See if it was just this one girl I had feelings for because she was an awesome person or if it's females in general. But how do you change your mindset?? I know when a man is flirting at me, or looking at me or whatever but I have no experience with a woman and how to act or what to do.