The advice of a friend or relative will provide an invaluable, logical perspective.
You can't think your way out of a problem without combining it with action. If you overthink, you'll get stuck going round and round like a broken record, wondering where things went wrong and spiralling down into the depths of emotional despair. What do you want to accomplish? What small, tiny step can you take right now towards achieving that goal? The smaller, the better. Inch by inch, you'll get there.
It might be tempting to follow your instincts on this one, but it will be far more lucrative if you do thorough research first and base your decision on facts.