Yeah. Firstly, never giveup! Barr (Barre?) chords are the hardest. It takes time and perseverance.Two techniques you can practice is to make your index finger as completely straight and rigid as possible.The second is to turn on the side so the bone of your finger is pressing down the strings. Once again, it's hard, but with determination, you'll succeed. Believe me, we've all been there.

A third option would be to break it down step by step. Focus on the index finger forming the barr then concentrate on the chord shape you're working on.

Remember, it's all muscle memory. And our muscles are built to be trained.