Is the sentence when I'm with a boy i feel ecstasy a good sentence?

Ecstacy isn't a Word. Ecstasy is. Ecstasy means happiness. Ecstasy is a adjective, such as The boy's face suddenly shot up a face of ecstasy.

Second, I don't feel comfortable about answering something to a "Gay" person.
Or Homosexual if you will. Or Bisexual. Your choice.