I wouldn't be so negative in your predictions. It really isn't that bad as you think.
Besides that: lines do change. Lines can disappear and grow,
what will give your future a complete different outlook.
You don't own your future yet. Keep that in mind.
Your heart line shows me, you reason with your heart (instead of your mind). You care for people, especially relatives.
You are a feelings-person, a risk taker, you want to expand your horizon,
you have an ambitious heart, and are full of honour.
You really want the prince(ss) on the white horse! Nothing less! Your wife/husband should be perfect.
With your relationship lines pointed downward slightly it doesn't mean you will have awful relationships.
It could mean that you always feel the relationship will need some improvement. You're not easily satisfied.
You two still can be very happy!
Also want to say that with this temperemant outer-marriage woman/man can easily seduce you.
Also your heart line tells me, you could have more confidence in your own being.
It seems you've been hurt as a child, and became a little shy to give your love/joy/enthousiasm away.
That's why, when its not in your nature, you are too serious sometimes, and forget to have pleasure, or see the sunny side of life.
Because inside this seriousness suffecates you, you have the tendency to escape from reality, to ease the pain that the reality sometimes brings.
This can work in two ways:
You tend to use alcohol, sugar, caffeine, cheating or drugs. Be aware that you are easily addicted to these things, so keep your gard up.
Be honest to yourself when 'the booze' crosses the line of being recreational or a relaxing end of the day.
Or on the other hand, you could become very religious, that other people would see as in a rather extreme form.
Yet it would give you sort of peace of mind to give yourself completely to faith and hear from religious leader how to live.
Meditation or prayer will help you, to make your mind stronger, so you won't loose yourself in negative attitudes, dreams and such.
I think you are a very good person. You only have to believe this for yourself. It would make your life better in many ways.
Peace, Maya