The most sensible advice on the subject comes from Tara Strong, speaking voice of Twilight Sparkle: "It's ok to be in love with an animated drawing as long as you understand they cannot put out."
No. So you have a crush? No biggie. Everyone gets them. I had a brush on Bea Arthur. Maybe that's weird to some people but I don't care.
What's a brony? You mean lesbian?
No, I don't think you need help at all.
Don't worry, I have a crush on Applejack, so you're not the only weird person.
How deep is your "crush". If it is just an admiration then I think you are OK. If you like envision sexual relationships with rainbow dash, I would recommend help.
Get help
This is really weird, but I have been watching MLP and yes I am a brony and I have developed a weird crush on rainbow dash, I don't know why, they are just so cute. Should I get help?