Look, your feelings aren't "wrong". You can't have "wrong feelings". What's "right" or "wrong" is how you ACT.
It's hard to move on, I know, but you have to. You have to set your mind to forgetting about him. Go see a movie, eat some chocolate, shop, get your nails done... anything that makes you happy and will be good for you. Excersize. Nothing like endorphins! Let time work its magic.
And truthfully, a part of your heart's probably always going to belong to him. But don't let him have more than that.
As far as therapy goes, why don't you just tell your parents you need to see one? If they push for a reason, just say you're confused, or that you'd rather not tell them. Hopefully they'll understand.
I wish you all the best. Hang in there.