Hi,
In Stuart Lichtman's book he talks about how to set very specific objective to attract a partner.. specific to the extent of mentioning hair color and eye colour in the objective.
His technique involves a detailed process of setting an effective objective that is clear to your subconscious, dissolving any limiting belief and unconscious habit pattern that we could have developed. I feel these would really help in your case because growing with a negative person around is a surefire way to develop a lot of self-defeating beliefs which is a huge blocker to manifestation.
I have tried his method twice in other contexts and have had success.After I accomplish the current target I m working on I'm planning to attract a PERFECT partner of my own
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But if you are considering to try his method be warned it takes work and effort to do his processes. But its worth it if you ask me.