Welcome to the forums, it's great you've come here to seek some support during this confusing time. It's excellent you've taken the courage to speak about your issue, that's what I'll commend you for firstly. :)
It's great to see another member of the LGBTI community.
Regarding your sexuality, it's tremendous you have discovered yourself and your feelings for the same gender. Random unwanted thoughts though unwanted are pretty healthy, I myself being gay wonder "What happens if I kissed that girl?" "Would I enjoy it?" then, to be honest, I think "Am I still gay?". I've had a good five/six years knowing I was gay, but I still question it all the time, there's entirely nothing wrong with it.
As monkey_magic said, you're normal; you're another beautiful human being as good as everyone else. Even if you're comfortable with it, nothing is stopping you exploring your sexuality with women, not saying it has to be with your best friend (I'll touch on that one a little later in the post) but there's absolutely nothing wrong exploring yourself with women. You might even enjoy it :) but you have to be comfortable with it, it's something that shouldn't be forced.
RE: "I cried over this for days and nights I started obsessing over it." There's nothing to worry about mate <3. I know it's easy for me to say that, but think about it as you have done, there's entirely nothing wrong with the idea. Think of it as opening a range of new pathways and experiences.
If these thoughts are getting to you too much, I suggest some techniques to calm down such as writing about your feelings, speaking to your best friend even about what you have experienced (there's nothing better than talking to someone, it'll feel so good after, it'll also do wonders for your mental health, it also doesn't even have to be your friend), or just doing one of your favourite hobbies.
The thought of kissing your best friend is entirely rational, it shows the trueness of your relationship as friends. It's really up to both of you if you decide to continue something, but don't be afraid to take the leap if you're entirely comfortable.
You may need to prepare yourself for the idea of being a bisexual male, I mean who doesn't love the idea of obsessing over boys right? :) But it may indeed not be you.
Look I hope you can keep us in the loop of what's going on, I hope my reply helped, I can tell it's all over the place and for that, I apologise.
Best of luck,
Connor <3 :)