Would it be okay for me to admit my feelings to a girl who has a boyfriend?
How many people have you confessed your feelings to?
No one else
It is wrong to interfere with another persons relationship. You should find some one who is single instead.
That is not what I meant. You misunderstood me.
It may not be how you are looking at it, but to ask her out while she's dating someone else means that you are essentially trying to tear their relationship apart. That's wrong, and you should wait to see if their relationship naturally falls apart before you admit your feelings.