Never ever compare your current with what happened in the past. Nothing can potentially kill a good working relationship like making your partner pay for the deeds of your or his/her past.
Don’t confuse imagination with reality. I have done that. Trust me, I’ve been a freaky person who starts to overthink and almost internally killed myself from being paranoid. It starts where you imagine things that doesn’t even exist in the first place. Creating problems every time and trying to read everything.
Don’t let your mind play crazy tricks on you. I know it’s hard. So hard that, you, yourself, is your enemy. Then again, you just have to face the facts sometimes. You have to rely on something that exists and use everything you have right now to your advantage.
You’re the only one responsible of your happiness, not the others. So, don’t let yourself ruin it for you. You deserve the best. So, go ahead and get it.