I've had a really rough 10 years and the one thing that has kept me going is planning, looking forward to and going on holiday alone. I have done this as a disabled person.
I have been to so many amazing places and done them all in the cheap (as in 3. 5 week safari, including all flights, safaris, campsite fees and all meals for under £1,500). I do hostels, camping and homestays (in India).
I book my return flights and one night accommodation (hostel or campsite); after that I go where I fancy, whether that is staying in the same country or going to another, whatever I fancy. I booked return flights to Bangkok, 4 week stay, and went to Vietnam, Laos and Cambodia all on the spur of the moment. Getting a tad nervous just adds to the excitement and adventure!
I spent 3 weeks in India, starting in Delhi and travelling to Agra (the Taj Mahal is amazing) and down to Tamil Nadu where I visited a hill station, staying with an Indian family, Mamalapuram where I sat underneath the famous "Butter Ball" (see photo) and Chennai.
Revisited India as I loved the rural places so much.
I've been to Zambia, Zimbabwe, and Botswana camping then hostels in South Africa (Johannesburg, durban and Cape Town) and camping in Namibia.
I've been to 17 European capital cities and by Road from in the US from North Carolina, through South Carolina, Georgia, Alabama and Luoisianna and flew up to New York.
A few days in European capitals doesn't have to be expensive, cheap flights, hostels away from the expensive areas and buy a travel card for cheap bus and metros.
Not once have I felt lonely, scared or bored. There are always people to chat to, a bar to be sat in with a vodka and a sky full of stars to look up at.
There are also groups online where you can arrange to travel with someone else, in case you aren't ready to go it alone.
And, if for some reason you aren't enjoying yourself you can fly home early!
GO FOR IT - HAVE A GREAT ADVENTURE