When indecision creeps in within your relationship, it can mess things up for you.
Not all decisions can be instant. But you need to decide. The best decisions are those you make yourself, with your own mind and using all reference points you can that are sound and valid.
Firstly, you do not need anyone to make you feel loved, wanted or happy. It is not anyone's responsibility to do those things for you even if you are married or a siamese twin.
Secondly, if a man hits you, it is highly likely he will do it again to you or someone else except if he sees and bears the consequences.
One such consequence is to utilise your space wisely.
If you are roped in a flatshare or homeshare, use your room, or move into one room in the house and leave him in the other.
It gives enough distance to make a point and achieve safety while allowing the man room to consider his next steps carefully.
Any man who tells you that you cannot survive without their presence needs to frankly be given a long bit of distance.
Your destiny does not lie in the hands of any man.
Self esteem is the way you perceive yourself, and to start with the key to finding that inner peace is to take some time out.
Go home for a weekend or go to a relative you feel comfortable with or a friend.
The fact that you mention the word "people" in your post means you know other people apart from this man.
So you need to use your friend support network for a while
When you find your alone time, don't spend it telling anyone all about what happened, who did what , why when where..... our friends are lovely as rocks of support but not trained therapists. So although we do not notice or realise it, sometimes we actually end up repeating the same tale of woe with new added memories which can become overwhelming for any friend.
Good friends will give you time out to just be
Write down how you feel, how he makes you feel and how you want to feel
Find 50 reasons/things he does, meaningful things that make him a good person to have in your life and write them down
Write down all the things he does that make you feel bad
If the bad things have the word hit, slapped, kicked, insulted, abused, threatened, drunk, criminal etc in them more than 10 times
Then..... as difficult as it may be and young that you may be as i perceive it,....it is time to move on.
There are so many men out there
But from what you say, it seems you need a break... some time to rediscover and find yourself and to really define yourself and develop your inner self.
it involves learning to be unafraid of your own company and learning to appreciate the body you were born with, and of course appreciating yourself.
Relationships are not easy, but bad relationships are like entering a demolition derby on a bicycle, you'll fall off and get hurt badly. Simple