"Must" is too strong here. Try these: I am alone. What should I do? I am alone. What could I do? I am alone. What can I do? I am alone. What do I do now? "To do" is the 'dictionary' form... the infinitive form. You wouldn't use it with a 'helping verb' like 'must'.... (must to do = not a good phrase. Better is "what must I do?".) Please don't forget to put a space (or two spaces) after a period. Your sample is not so difficult, but would be hard to read in a longer example. It is common for people to leave out spaces on Text Messages (SMS) because there are only a few characters allowed per text message. But if you're not using a cell phone, then it looks dumb & lazy. You are obviously neither because you have put forward effort to learn another language. Why not do it properly!

I think the main problem lies in the fact that people start thinking they are 'sadly' alone when they have too much free time. Please, don't misunderstand what I said before, if you find something interested to do you won't feel alone, you'll find yourself full of positive energy, you'll probably meet people. Another important point, if you cannot stand being alone, you should be more outgoing, don't be afraid to talk with people you don't know. Try to find friends then, a girlfriend. P.S. Don't see the fact of being alone as a bad thing. This is the time you have to grow as an individual, not to sit down and wait for someone. Don't be a sad person! And what people told you above is true. None is never alone!

i feel that's nowdays no 1 is a lone . you can find alot of freinds especially through net.

you must find a lady for your loneliness

so so ..