No gym, no weights, no chance =/

I could attempt to show you a better dieting to increase mass (in general), but without the weights, you aren't going to increase your muscle mass. Doing calistenics and cardio isn't going to increase your size so much, but rather solidfy it and increase stamina.

how about push ups curls and some at home personal weights ?

I had the same problem, lol. Except I could go to the gym. Here's some tips:
1. Eat lots of small meals throughout the day
2. Muscle explosiveness exercises might build muscle, I'm not sure, but it may work. Use clapping pushups for upper body and jump squats for lower body.
3. Pushups and curls will increase stamina and solidify muscles, but that may be desirable even if bulk is ur primary goal
4. U have at home personal weights? Well, since I'm assuming they are smaller than gym-sized weights, u will only be able to train the smaller muscle groups:
-Bicep curls for biceps
-Wrist curls for wrist/forearm
-Tricep curls for triceps
-Trap lifts for shoulders (with a dumbell in each hand and arms down, lift ur arms up while keeping them straight until ur arms form a straight line)
-U cant do benching, so just use pushups for chest
-U cant do lat pull downs on a machine, so just use pullups on a tree or something for upper back
U can incorporate home weights into ur lower body routine by holding dumbells while doing squats (for upper legs) or calf raises (for lower legs)