when no one has expressed any interest in being with you
I flip that around and ask myself if I've expressed an interest in spending time with others.
When money is tight, I'll make myself head out to the library or bookstore. I like looking at glossy magazines to generate ideas for my bucket list; dreaming about hobbies and destinations doesn't cost anything.
Speaking of ideas:
A aerobics, archery
B bicycling, bowling, badminton, basketball, baseball, boxing, board sport
C cooking classes, canoing cheerleading, cross training
D dancing, dog walking, diving, darts
E exercise, equestrianism
F fishing, football
G gardening, golf, gymnastics, grappling
H horseback riding, handball, hockey
I ice skating
J jumping rope, jogging, jai alai
K kayaking, karate, kickboxing, kiting
L lifting weights, log splitting
M meditation, martial arts
N netball
O orienteering
P pilates, paint ball, parachuting
Q quad biking
R rock climbing, running, rowing, rugby
S sex, swimming, shooting, skiing, scuba diving, softball, surfing,
T tennis, table tennis, trampolining
U unicycling
V vigorous sex, volleyball, video games (Wii sports, etc.)
W walking, weight training, wrestling, water skiing
X xylophoning
Y yoga, yachting
Z zumba