Re: what are the signs?
The problem here is that low self-esteem or lack of respect for yourself can become a self-fulfilling prophecy: people see that you don't value yourself and start to treat you accordingly.
You must respect and value yourself in order for others to do the same. Work on the positives. Look at your achievements. There are many self-help books I could recommend like Paul Mckenna and Anthony Robbins.
Once you start to see yourself differently others will do the same and you may even get rid of some people in your life because you realise that they weren't right for you in the first place.
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KK
Never Surrender, Comrade