What to do if two guys ask you to prom?

Okay, this is a dilemma.. a really good friend of mine asked me to prom like 5 days ago, and I knew he wanted to go with me, because he has told me, that he is in love with me. I said yes, because I think he’s sweet and I like him. Then the other day another guy – also one of my bestest friends – asked me, if I wanted to go with him to prom.. He says, that I am the sweetest girl he knows and that he really likes me, and we really have a lot in common and that’s awesome, really. I can talk with him about everything.
Now the first guy is kind of shy, and he can only tell me what he feels while we’re texting. He could never ever come to me in real life and say something like “hey, I like you” but he’s texting with a lot of emotions. He likes me. Or likeD me.
I didn’t know what to do and I thought about it aloooot. I really want to go with the second guy, because I like him more and my friends say ‘do what YOU want to! Who do you like the most? Think about what YOU want!’ but I knew, that the first guy would be so sad about it and I didn’t want to hurt him, because I know, I’m one of the few people he trust – I don’t know if I’m still one of those people..
Well, at first I told the second guy, that another guy had already asked me, but then the second guy was like “arh, I wish I asked you before!” and if he just had asked before, I wouldn’t be in this freaking dilemma.
I said to the first guy, that I was really sorry about it, but this other guy wanted to go with me to prom and the first guy was like “It’s okay, don’t think about it” – but I don’t know if the first guy is okay, because at first we planned to go to prom together, but then I.. ugh!
Okay first… Does it make me a gigantic bitch, that I’m trying to do what I want? Is that freaking selfish and not okay? Because I’m so confused, and I think about it all the time! Prom is in like 3 weeks, and I don’t know, what to do.. I don’t want to ruin my friendship with the first guy, but I really want to go to prom with the second guy..
And second.. Is it wrong? How can I decide something, that would make everyone happy? I KNOW that you can’t please everyone, but I’m just super confused, because I didn’t think anyone would ask me to prom and then two guys do? Argh… I really don’t know.
I think it would be the best for me to go to prom with the second guy, and the first guy said it was okay – but I guess I have to talk to the first guy face to face and really ask him if he’s okay.
I don’t know if you guys even understand this question, but basically I just want to know if I am a selfish bitch because I decided what I did?.. Is it wrong? I’M JUST SUPER CONFUUUUUUUUUSED :((