I am afraid that only my consciousness exists. That basically my consciousness simulates my body and the entire world. Please help me.
Argument 1: You don't (entirely) believe in Solipsism anyway
You asked for help. Therefore, you believe there's someone besides you to answer. (Or at least, you consider the possibility that someone is there to answer.)
Argument 2: The pragmatic approach
The world may indeed be a figment of your imagination. The world may be a simulation like the matrix. The world might be thoughts in the mind of God. The world might be completely real. Regardless, when you stub your toe, it hurts. When you decide that your mom is going to change her mind and give you dinner even if you don't clean your room, she still withholds your dinner until you clean your room.
When considering whether things are "real", you should not give equal weight or consideration to every argument that can be abstractly argued for, but base your notions on what actually makes a difference. If that isn't real food you're eating, or real air your breathing, you still get weak if you don't eat, and light-headed if you don't breathe. Whether you are a figment of your own imagination, or God's, or whether reality is as real as it seems... Physical laws still apply. You might as well act as if the laws that apply are, well, the laws that apply.
Sure, those laws might be something simulated by your mind, but unless you can turn it all off, what difference does that make? Other individuals still act independently of your conscious will, gravity still pulls you down, hunger still hurts, etc. Maybe it's just a fantasy that you'll lose your job if you stay home and don't work, but your mind is consistent enough that the check will not show up when you don't work, so get out of bed and go to work.
Argument 3: Humility
Stepping outside of a shallow, selfish world view, there are 2 problems with solipsism:
- What makes you think you're that important?
- What makes you think you're that smart?
By taking the position of disbelieving the rest of the universe, and the personhood of everyone else, you've basically said that you're the only important thing (the only real thing) in the universe. Do you really believe you're the most important thing in the universe? (I don't.)
(If you haven't already), study calculus. If your mind is simulating everything, then it's awfully convenient that you reliably work the math out correctly for gravitational acceleration to correctly cause every path the ball you throw to be parabolic (less wind resistance).
Or crack open a history book, or a newspaper. Read about the wars and revolutions involved in the Protestant reformation in Europe. Read about the forced labor camps in Russia under Communism. Read about how in 1959, the Japanese prefecture of Yamanashi suffered a severe typhoon, and how Iowa sent breeding hogs and 100,000 bushels of corn to relieve the Japanese. Are you making all of that up as you go along?
Are you actually smart enough to endlessly make up an infinitely deep and complex world? (No, you aren't.)
Or any of the next 30 pages of results on this site returned if you search 'solipsism'.
Fundamentally, anyone taking solipsism seriously, shouldn't care what others think. So asking questions and discussing already shows how difficult it is to have conviction in it. In philosophy, where discussing and asking questions is a given, it should be understood as a thought-experiment, like also p-zombies, aimed at understanding how we know what we think we know, rather than being something anyone in practice can live with or truly take seriously (it would actually look like a mental illness, like extreme narcissism or monomania).
I would point to intersubjectivity as the deepest argument against solipsism, as for instance implicitly involved in the Private Language Argument - we rely on a community of language users we were raised by and with for the conceptual detail of our thoughts, terms like 'self', 'existence' and 'solipsism' likely can have no meaning to animals that don't use language, however individually bright they are.
Adults don't appear from nowhere, words don't appear from nowhere. They are emergent in interactions, and reflect and embody the existence of things beyond themselves, in ways the metaphor Indra's Net can help us to picture. Reality is an intersubjective peer-to-peer experience, not one place but a shifting network of experiences.
Discussed with more detail here: Is there anyway to prove things happen/exist if I'm not aware of them?