I need a little advice and maybe a prayer or two

Hello, i dont even know where to begin exsept to say that emotionaly i feel so lost so alone so cold. I've been lied too, cheated on, lead on, used and the sad little list goes one. I guess i'll get to the point of this I need advice help a friend who can see things clearly- i'm in a realtationship and in the begining like most things were great better then great i actualy felt like it was love and lust comingeling but then today we had a fight that just shook my whole fondation- i know what your thinking here she is complaining about a little fight but i have what one would call relationship battle scars its hard to trust others its terrifing to do new things - but i guess what i need help with is seeing things diffrently - a stupid question 'how does one become happy' i want to change i dont want to complain or date endlessly bc im affraid of lonelyness or anything else how do i change this any advice?