Being anti-social, in the sense of avoiding social interactions and preferring solitude, is not inherently good or bad from a religious perspective, including Christianity. Christianity, like many other religions, does not explicitly dictate specific social behaviors such as being outgoing or introverted.
What matters more in Christianity is how one treats others and lives out their faith. Loving others, showing compassion, kindness, and being of service to others are important Christian values. Being anti-social might make it challenging to fulfill some aspects of these values, but it doesn't necessarily make you a bad Christian.
It is essential to find a balance that works for you. Some people naturally enjoy socializing and find their spiritual connections through community involvement, while others may prefer more solitary spiritual practices. Both approaches can be valid as long as they align with the core principles of Christianity.
If you feel that being anti-social is causing you distress or preventing you from living a fulfilling life, it might be helpful to seek guidance from a trusted spiritual advisor, counselor, or therapist. They can provide support and help you find ways to integrate your faith with your personality and social preferences. Remember, Christianity places a strong emphasis on love, understanding, and acceptance, so being compassionate towards yourself and others is essential.