I thought I was a lesbian until recently…..

Hi, my names Lara (17). And until recently I thought I was 100% a lesbian. Sure I always thought men were attractive, but not like "OMFG", you know what I mean? Like something felt off. Every time I thought about dating a guy it made my inside tighten and rly uncomfortable. And every guy I know (expect a few) is like not datable at all. Thinking about dating a guy makes my insides feel tight and uncomfortable. But now I think I like my guy best friend. We've been best friends now for a few years, and he's the only guy I know that makes me feel unconditionally safe, trustworthy, warm and like I can be myself without being judged. He's rly nice, funny, smart and caring. I've been having thoughts recently where I wonder what it would be like to date him, and I feel happy. I think about hugging him, cuddling him, holding his hand, wanting to spend time with him every day, text him, and I feel a little jealous when he's chatting with other people. Thinking about this is kinda driving me insane. I'm so confused because I think I like him but I'm not sure at the same time. I've never had a proper crush before where I like someone (also I've never been in a serious relationship before. The longest relationship I've ever been in was a week) so I don't know what it feels like. I don't know if what I'm feeling is romantic for him or purely a great platonic friendship for him. If I do have a crush on him I'm definitely in denial, because I'm scared if we did start dating what if we don't work out and I lose him as a best friend, and if we do start dating I rly don't want all my friends to rub it in my face.

Please give me advice🙏❤️🏳️‍🌈