Hey man,
sounds like you have defined it pretty clearly.
About your issue - I think probably 98% of people never in their life really decide what they want. So you, by clearly defining what you want fit in the top 2% of people in the whole world.
As for worrying about failing at your plan - listen, there is some weird power when you can clearly specify what you want. And if you are serious about getting it, the gate of access will be granted to you.
As for the failing itself, you really can't fail if you think about it- you can always try again, and again, and again untill you succeed.
For your friends laughing at you- you need to think about this like this: Are they going to pay your bills? Are you living your life for your friends, or for yourself? You are the only one responsible for what it's going to happen in your life. And at the end of your life, when you'll be on your death bed thinking about your life - if you don't do it, you're going to have regrets. But if you do it, you will know that you did what you wanted to do in your life.
And nobody will be able to take that away from you.
Hope you found this answer useful.
www.volcanoconfidence.com
Fantom
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