TCP and UDP, blocked ports

[i dont exist]

I use my college network which I believe has blocked the UDP ports. I could connect to Steam only via VPN, which again, was not able to use a UDP connection type, but only TCP.
Today I've read steam forums and found out this solution to be able to connect to Steam without using a VPN:

Right mouse click the Steam shortcut on your desktop -> Properties -> Target
Change
"C:\Program Files (x86)\Steam\Steam.exe"
to
"C:\Program Files (x86)\Steam\Steam.exe" -tcp

Try to run through the shortcut; forcing Steam to use the TCP port protocol instead of the UDP.

However, the steam servers in game info are still not responding. I want to play Left4Dead2 but the gameinfo won't work and it won't connect to any server. My question is: is there any way to force TCP for this as well? I'm sorry if this sounds dumb, I'm quite bad at this sorta things. I want to know if there's any way to connect to servers without using a VPN, which I've been doing until now but it's a total pain and struggle. (I'd appreciate if you could also recommend me any stable vpn in case there's no other way). Thank you.

Edit: when I'm trying to connect to a L4D2 server it says Sending UDP connect to public IP.... but it won't ever connect, which again, makes me believe that UDP is blocked by my connection.

[LeviathanWon]

Cause they just think that it's somehow better for games, cause "games" will run better or faster... it's sad, but who cares cause most of the games are crap anyways.

[HIVEmind]

there's nothing you can do. college is blocking. I'm sure your not the first person to try. find another game.

[Emma]

This thread was quite old before the recent post, so we're locking it to prevent confusion.