On the whole, I would propose an emphatic yes! From someone who's lived a closeted life for at least 13 years, I find that living with a lie is the worst thing you can do. I cannot describe the relief and contentment that arises as a result of finally accepting the fact of being gay.
Yes. But this isn't to push you out of the closet, it is just to give you a general idea of how I felt when I came out to a couple people: Pros - It gave me the confidence to tell another person. Coming out taught me who my real friends were, and who really loved me. Coming out made a huge deal to me sound like nothing to others. It gave me a sense of relief, and I no longer stress out as much. It also taught me that I there are really nice people out there, and they are probably closer than you think. You won't have to worry about not ever coming out or not ever getting married, because you will one day. =) Cons - Internalized shame (In my case) Worry that someone will find out (Irrational to me, except for the fact that maybe you are still young and dependent on your parents. In which case, do not come out.) Worry that no one will love you. (Love yourself, and others can love you.) So, yes, they do. =)
This question cannot be answered out of context. You must first considering the specific details of your situation. Are you in a situation where your work, school and/or living arrangements can be compromised if people do not take the news well? Is there reason to believe there may be threats of physical violence, emotional abuse, etc., if you come out?
It depends. The biggest pro is that you aren't living a lie. You are free to be yourself. However, it doesn't mean anything else. You aren't guaranteed a relationship. You are going to have a higher chance of being harassed. The list goes on and on. But look at your specific situation and see what happens!
My situation pros and cons. Pros: I get to start transition, I get called by my preferred name and pronouns, a little of my pain leaves. Cons: I have to deal with my dad who will not support me at all, get an awful time at school, most likely have to leave my church (long story why I'm still there), lose some of my good friends. Ehh... still in the closet