Sounded pretty decent to me. Definitely needs some work but that's completely understandable if you've only been playing for 6 months. This was actually one of the first songs that I learned too. Just as a tip when you do a cover song it always helps to remember the lyrics .

In general I think you just need to work on getting the notes down; there were a few mistakes here and there. Play with confidence (this will only come with practice and just playing a lot). The opening riff had quite a few wrong notes, but the closing riff sounded flawless. Your guitar also sounded slightly out of tune in some spots.

Overall great job for someone who's just starting out! Keep on playing.