If your having trouble with soloing, first of all, don't worry. Soloing is something that just comes with time and practice. Secondly, and this might sound weird, but you might be either feeling the music to little or too much. If you don't feel and connect with the song, then the solo won't go well. The same can apply if you are so into the song that you forget everything but soloing. Part of it can be ego (and there's not a guitarist among us who can truthfully say that this is incorrect). Guitarists are notorious for their egos, especially shredders (not that there's anything wrong with shredding, but my experience has shown me that all they think about is the solo). To remedy this, don't go into the solo with the intention of wowing people, or making the song great (although each of these are possible), just go in and contribute what you can to the music. Simplicity can be the key. Don't think that fast solos are better. A nice smooth solo that fits the mood of the song says way more about a person's musicianship than whether they can play 32nd note runs all the time. Just wait for it to happen, man. You've got your whole life to improve this area and find a style that's your own, so don't rush it (pun intended!).