well, first thing, if you're not using pans (a lot of ppl dont), try panning your instruments in different directions to give the mix bus some room to breath. Keep your main drums (K, SN, HH) panned center, bass panned center, and lead vocals panned center. Everything else should have its own space somewhere in the mix. Now, if you are making good use of pans, then try losering the level of everything. Generally when I start a mix, my kick drum(s) are sitting at around -10db.
Also, even though you are seeing clips, are you HEARING clips? The meters in a lot of software applications aren't exactly accurate and a lot of times if you don't hear that clip, it's usually 1 or 2 samples (44100/96000 etc) in the waveform that have clipped, which you are NOT gonna hear.
Also another thing, don't worry about the loudness of your mix. The point is to get a good solid blend and sound, then the track goes to mastering where they will pull the level up and get it sounding crisp. The problem here is, a lot of bedroom producers want their mixes to sound loud, which is understandable because nobody wants to pay for mastering if the tracks arent getting major placements. What you can do is throw an L2 or Maxim plugin on the master fader (after you've lowered the levels of the rest of your mix), and this will maximize the loudness of the song. Keep in mind, its basically just smashing the whole sound, so use it in moderation.
you can also find a multiband compressor plugin (or hardware if you have it), and throw that on your stereo bus. The problem here is most young producers have never even heard of a multiband compressor and wouldnt even know where to start when using it. But play with it. If you feel the bass isnt sticking out enough, compress the Low band a little more, etc etc. Try to use your ears. Hopefully a combination of all these things can help you out. But the BIGGEST thing, is start mixing with a kick and snare level of approx -10db...goo starting point