Space Madness:
Although I no longer believe in the Bible, the atmosphere and positive association will help me become the person I use to be. My life is all negative now and I need something positive to balance it out.
If your life feels 'all negative', it might help to talk to a doctor or counsellor. Assess whether everything really is 'negative', or if you're suffering from depression.
It would be a basic fallacy to assume that 'being a JW' (especially if you realise it's not true) will make you 'happy', and association with JWs is far from the only way to 'balance' your life. There's nothing unique about being a JW that makes people happy, so you should be able to make whatever changes are required without needing that crutch.
Given the peer pressure to conform among JWs, it will almost certainly make you unhappy if you go along with 'preaching' a message you don't believe. JWs tend to focus on all the negative things in 'the world', so associating with them isn't likely to make you feel more positive, especially if you recognise that their only sense of 'hope' is based on lies.