Dude, just go and have fun!
Alright so it feels like bigzoman is finally right about something. It's taken a long time to get to this point but I'm kind of with her on this. Don't worry about it too much. Just have fun. Like, you're fine, you know? Have fun. If it doesn't work out, it doesn't work out. You're always gonna be messing stuff up at that age, your feelings will change like the wind. Don't focus too much on like "oh are we going out with each other" or whatever. It's always weird when you just jump into "THIS IS A RELATIONSHIP" in school age. Just hang out. Be friends. If you wanna be friends who make out, then be friends who make out. If you don't, then don't. Don't feel pressured into doing stuff you aren't into, and don't pressure her into doing stuff she doesn't wanna do and it's all chill yo.
Let it go wherever it goes.
Yeah, it's normal to change your mind about someone pretty quickly. I've experienced it myself when I was around your age, thought I liked someone, we kissed and went on a date, and I just didn't feel the attraction. Nothing particularly unusual. Hormones can be fickle.
I'd advise giving another try at a date, maybe that double date you mentioned - see how it goes, have some fun.
I'd advise you NOT to get too physical with her, in case you decide that you don't want to keep seeing her. It'd only make things more complicated otherwise.
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Also.
"Is it normal to have second thoughts right after getting into a relationship with someone for the first time?" - Yes, especially at your age.
"Is it normal to suddenly not have the same feelings for someone from one day to the other?" - Yes, especially at your age.
"Am I going to fast with her?" - Yes, especially at your age
"Should I continue seeing her and seeing if things improve?" - If you want to. Totally up to you. If you don't feel it, you don't feel it, and that's fine. You get one life though, don't fuck it up stressing about "oh is this normal, is this okay" or whatever. Do what you want to do, whatever makes you happy.
-=Z=- Satan represents vengeance instead of turning the other cheek! -=Z=-
https://bdsmovement.net/
Stop.
Don't look for a good relationship with Young girls. Just have fun with as many as you can. Care about relationships once you get in your mid 20's.
Yeahhhh that's right you guys, you see! I'm useful for more things than just feminist rants!
Yo,
I cba reading the entire thread past your OP so if you've already had your answers then you can ignore this!
Seriously man, just go with the flow. Everything you said in your OP is 100% normal, the majority of people that had small relationships or short relationships when they were younger get that "Oh I'm not sure" moment, it's not the end of the world regardless of what you do. Your goal in life up at your age is to have fun and enjoy yourself with the company you choose to acquaint yourself with.
I hate to pull the hormones card but you seem smart enough to understand that you're going through a lot at this age and you're prone to making decisions that you won't always think through - trust me on this, we've all been there and experienced both the good and the bad.
Some highschool relationships work, some don't. If you think this is stressful, you don't wanna be an adult man... I'm buying my first house in the next month and there's nothing like an introduction to the real world than working with fucking estate agents!
Get drunk and turn off the lights, worked for me.