Well, I can only give you my personal opinion on those questions. Or how I answered them.
- Does god love me?
I'm an Atheist. So I don't believe that any deity exists.
- Am I worth that love?
Well, for said reasons I can't ask myself that.
- Does anyone understand?
A lot of people do, I think.
- Why is life so hard?
How hard life is depends in the end on the way how you perceive it. Now how hard it really is. And the way you perceive it you can change.
- Why does my sister still do drugs?
Probably for the same reason why my sister smokes and is overweight. Certain things are addictive, and some people are very vulnerable to such stuff.
- Why is my dad so stressed all the time?
Probably for the same reason why my brother is stressed all the time, and why my sister smokes. Some people simply have a specific mindset they can't free themselves of.
- Is my mom still in pain..
I don't know what the situation with your mom is like.
- Will life get better?
In general, yes, as long as you try to improve things.
- Will I ever find love?
Nobody can see into the future, but I assume that you are pretty young, and there are many ways how you can increase the chances of finding a partner, so as long as you try: sure, the chances are good.
- Is it even worth it asking these questions?
Depends. If you just ask them, think for a while and then contine with your life and to improve things: yes. If you do nothing else but asking those questions: no.
- When will I know?
The answers to your questions? Depends on a lot of things. On the experiences you make, and how quickly you mature.
- Can anyone feel my pain...
Yep.