" this thinking, the thinking of the possibility..." see if you can rephrase that a bit, I understand you're trying to write in the character of someone who's nervous but it just comes off as shaky writing and not a shaky character.

"your taste" If you mean taste in clothes, say so, taste has a few different meanings.

" Never outgrew it, didn't happen," too much like casual facebook instant messaging conversation, this one isn't that big a deal and I think it's more of a reflection of my taste than anything else.

"I never intent it to be that way. " change 'intent' to 'intended'

"It's just a burden that I need an answer to." See if you can rephrase this, the sentence is kinda short and simplistic and doesn't come off as good writing.

"I feel sad" Try and replace this with some better imagery, something that really tells the woman that he's sincerely hurt.

" Did you see how girls are today?" Change 'Did' to 'Do'.

", only think about their selves." insert a 'that' after the comma.

"a diamond in a mountain of dirt." Again, try with better imagery. A diamond in a mountain of dirt isn't particularly romantic. Focus on the diamond, the beauty, the object of his affection.

"I could have you" try changing that to 'be' it doesn't matter to some people and to others it does, but being with someone is a lot less hostile and offensive of a nature than having someone.

"this feeling with if you think about it." he doesn't need to justify his feelings, feelings are some of the most unjustifiable things in the world, stand with conviction and don't give excuses.

"However, I'm willing to risk it." perhaps change that sentence to 'However, I'm willing to take that chance.'

"No, I wouldn't tell you not to tell anyone, as that would give the possibility to make you uncomfortable. " Again it feels like your character is squirming and giving excuses, if he's ballsy enough to write a love letter, then be ballsy enough to stand behind it. Don't be a SAP in your letter. A possible different direction would be for your character to say 'Tell anybody you know, I won't hide it anymore, I love you."

"I will always think about the possibility of you and me together." Again a conviction issue, don't think about the POSSIBILITY of being together, just think about being together. That's what your character should really be thinking - his life with her and not the chance of maybe his life with her if he had an inkling of a chance, just maybe?

"I have Skype and maybe we can talk about it. I'm sorry if I caused you any harm by sending this." First off, that's like saying, uh ok thanks for reading this give me a call maybe, bye bye! It's super casual saying for someone to call on skype after confessing your love to someone. Just leave the Skype part out.

Don't apologize for confessing your love, take pride in it. I'd recommend removing that line too. End on a strong note in your confession.

OK one last thing overall that I'd like to mention is that your topic is "forbidden love" I don't quite understand how any of this is forbidden at all, I note at points where the character acts like he can't be with her for some reason, but that reason isn't apparent and it isn't made 100% clear that he can't be with her. Besides that I've written any other corrections I would've made. Don't feel down that I wrote so much criticizing you, that's just me being nit-picky.