Is playing too much bullet building bad habits for me?

Yes.

I've done that too. I can confirm you'll get bad habits

You don't have to quit blitz and bullet completely, just be sure you're mixing in some long games too.

Hi! My name is Lauren Goodkind and I’m a chess coach based in California.  My website is www.ChessByLauren.com.   

To ensure good habits, I recommend playing with a slow time control, such as game in 30 minutes.  You need time to think.  Beginners tend to make a lot of silly moves with very little time.  This makes sense since there’s a lot of pieces on the board.  

  I have suggestions for you to improve your chess game.  

I also offer a  free beginner’s free eBook on my website, www.ChessByLauren.com in case you are interested. The book is about asking questions before each move.  

   Before each move, I highly encourage you ask questions before every move such as, “If I move here, is it safe?”, “Can I safely capture a piece?”, and more.  

Also consider all checks and captures on your side and also your opponent’s side. 

Learn basic tactics such as the fork, discovered attack, pin, and more.  I offer interactive puzzles on my website: https://www.chessbylauren.com/two-choice-puzzles.php  

If you are serious about chess, I highly recommend you hiring a chess coach to help you.  

I hope that this helps.  

Play Longer Time Controls...

For many at the beginner-novice level, speed chess tends to be primarily an exercise in moving pieces around faster than your opponent while avoiding checkmate, in hopes that his/her clock runs out sooner than yours. Or being lucky enough to notice and exploit your opponent’s blunders before they exploit yours.

The point is, there is little time to think about what you should be doing.

It makes sense that taking more time to think about what you should be doing would promote improvement in your chess skills.

An effective way to improve your chess is therefore to play mostly longer time controls, including "daily" chess, so you have time to think about what you should be doing.

This is not to suggest that you should necessarily play exclusively slow time controls or daily games, but they should be a significant percentage of your games, at least as much, if not more so than speed games which, while they may be fun, do almost nothing to promote an understanding of how to play the game well.

Here's what IM Jeremy Silman, well-known chess book author, has to say on the topic...

https://www.chess.com/article/view/longer-time-controls-are-more-instructive

And Dan Heisman, well-known chess teacher and chess book author…
https://web.archive.org/web/20140627052239/http:/www.chesscafe.com/text/heisman16.pdf

https://www.chess.com/blog/RussBell/dan-heisman-resources

and the experience of a FIDE Master...
https://www.chess.com/forum/view/general/how-blitz-and-bullet-rotted-my-brain-don-t-let-it-rot-yours

for additional, helpful resources check out my blog...

https://www.chess.com/blog/RussBell

Too much fast chess is bad for your health, really bad:

Carpal tunnel syndrome; Stress, Heart issues...

Without any doubts.

I was addicted to blitz games as you are to bullet. And I also played all day and night long.

I think that this long long playing even had bad impact on my phisical conditions... I mean I felt myself unhealthy after that.